diff --git a/main.py b/main.py
index 68281c6..f2ad7ec 100644
--- a/main.py
+++ b/main.py
@@ -8,6 +8,73 @@
 
 from models import HadithCollection, Book, Chapter, Hadith
 
+# sunnah.com publishes these as standalone collections, but their hadiths are
+# stored as books of `forty`, so every lookup must also match the book.
+COLLECTION_ALIASES = {
+    "nawawi40": ("forty", "1"),
+    "qudsi40": ("forty", "2"),
+    "shahwaliullah40": ("forty", "3"),
+}
+
+
+def resolve_collection(name):
+    """Return the collection and book that store the hadiths of `name`."""
+    return COLLECTION_ALIASES.get(name, (name, None))
+
+
+def serialize_as(name):
+    """Echo the requested name so an alias response never reports `forty`."""
+    return {"collection": name} if name in COLLECTION_ALIASES else {}
+
+
+def alias_collection(name):
+    """Build the collection resource of an alias from its book row."""
+    collection, book_number = COLLECTION_ALIASES[name]
+    book = Book.query.filter_by(collection=collection, status=4, ourBookID=book_number).first()
+
+    if book is None:
+        return None
+
+    return {
+        "name": name,
+        "hasBooks": "no",
+        "hasChapters": "no",
+        "collection": [
+            {"lang": "en", "title": book.englishBookName, "shortIntro": ""},
+            {"lang": "ar", "title": book.arabicBookName, "shortIntro": ""},
+        ],
+        "totalHadith": book.totalNumber,
+        "totalAvailableHadith": book.totalNumber,
+    }
+
+
+def resolve_book_collection(name, book_id):
+    """Resolve `name`, rejecting a book that is not the alias's own."""
+    collection, book_number = resolve_collection(name)
+
+    if book_number is not None and book_id != book_number:
+        abort(404)
+
+    return collection
+
+
+def ref_condition(collection, hadith_number):
+    """Build the filter matching one `collection:hadithNumber` reference."""
+    name, book_number = resolve_collection(collection)
+    condition = and_(Hadith.collection == name, Hadith.hadithNumber == hadith_number)
+    return condition if book_number is None else and_(condition, Hadith.bookNumber == book_number)
+
+
+def ref_match(results, collection, hadith_number):
+    """Find the hadith matching one reference, scoped to an alias's own book."""
+    name, book_number = resolve_collection(collection)
+
+    for h in results:
+        if h.collection == name and h.hadithNumber == hadith_number and book_number in (None, h.bookNumber):
+            return h
+
+    return None
+
 
 @app.before_request
 def verify_secret():
@@ -22,15 +89,21 @@ def jsonify_http_error(error):
     return jsonify(response), error.code
 
 
+def unpack_query(result):
+    """Allow a route to return a query, or a (query, serialize kwargs) pair."""
+    return result if isinstance(result, tuple) else (result, {})
+
+
 def paginate_results(f):
     @functools.wraps(f)
     def decorated_function(*args, **kwargs):
         limit = int(request.args.get("limit", 50))
         page = int(request.args.get("page", 1))
 
-        queryset = f(*args, **kwargs).paginate(page=page, per_page=limit, max_per_page=100)
+        query, opts = unpack_query(f(*args, **kwargs))
+        queryset = query.paginate(page=page, per_page=limit, max_per_page=100)
         result = {
-            "data": [x.serialize() for x in queryset.items],
+            "data": [x.serialize(**opts) for x in queryset.items],
             "total": queryset.total,
             "limit": queryset.per_page,
             "previous": queryset.prev_num,
@@ -44,67 +117,109 @@ def decorated_function(*args, **kwargs):
 def single_resource(f):
     @functools.wraps(f)
     def decorated_function(*args, **kwargs):
-        result = f(*args, **kwargs).first_or_404()
-        result = result.serialize()
+        query, opts = unpack_query(f(*args, **kwargs))
+        result = query.first_or_404().serialize(**opts)
         return jsonify(result)
 
     return decorated_function
 
 
+def paginate_items(items):
+    """Paginate a serialized list the way `paginate_results` paginates a query."""
+    limit = min(int(request.args.get("limit", 50)), 100)
+    page = int(request.args.get("page", 1))
+    start = (page - 1) * limit
+    window = items[start:][:limit]
+
+    if limit < 1 or page < 1 or (not window and page != 1):
+        abort(404)
+
+    return jsonify(
+        {
+            "data": window,
+            "total": len(items),
+            "limit": limit,
+            "previous": page - 1 if page > 1 else None,
+            "next": page + 1 if start + limit < len(items) else None,
+        }
+    )
+
+
 @app.route("/", methods=["GET"])
 def home():
     return "<h1>Welcome to sunnah.com API.</h1>"
 
 
 @app.route("/v1/collections", methods=["GET"])
-@paginate_results
 def api_collections():
-    return HadithCollection.query.order_by(HadithCollection.collectionID)
+    items = [x.serialize() for x in HadithCollection.query.order_by(HadithCollection.collectionID)]
+    stored = {x["name"] for x in items}
+    aliases = [alias_collection(name) for name in COLLECTION_ALIASES if name not in stored]
+    return paginate_items(items + [x for x in aliases if x is not None])
 
 
 @app.route("/v1/collections/<string:name>", methods=["GET"])
-@single_resource
 def api_collection(name):
-    return HadithCollection.query.filter_by(name=name)
+    row = HadithCollection.query.filter_by(name=name).first()
+    result = row.serialize() if row is not None else alias_collection(name) if name in COLLECTION_ALIASES else None
+
+    if result is None:
+        abort(404)
+
+    return jsonify(result)
 
 
 @app.route("/v1/collections/<string:name>/books", methods=["GET"])
 @paginate_results
 def api_collection_books(name):
-    return Book.query.filter_by(collection=name, status=4).order_by(func.abs(Book.ourBookID))
+    collection, book_number = resolve_collection(name)
+    query = Book.query.filter_by(collection=collection, status=4).order_by(func.abs(Book.ourBookID))
+    return query if book_number is None else query.filter_by(ourBookID=book_number)
 
 
 @app.route("/v1/collections/<string:name>/books/<string:bookNumber>", methods=["GET"])
 @single_resource
 def api_collection_book(name, bookNumber):
     book_id = Book.get_id_from_number(bookNumber)
-    return Book.query.filter_by(collection=name, status=4, ourBookID=book_id)
+    collection = resolve_book_collection(name, book_id)
+    return Book.query.filter_by(collection=collection, status=4, ourBookID=book_id)
 
 
 @app.route("/v1/collections/<string:collection_name>/books/<string:bookNumber>/hadiths", methods=["GET"])
 @paginate_results
 def api_collection_book_hadiths(collection_name, bookNumber):
-    return Hadith.query.filter_by(collection=collection_name, bookNumber=bookNumber).order_by(Hadith.englishURN)
+    collection = resolve_book_collection(collection_name, bookNumber)
+    query = Hadith.query.filter_by(collection=collection, bookNumber=bookNumber).order_by(Hadith.englishURN)
+    return query, serialize_as(collection_name)
 
 
 @app.route("/v1/collections/<string:collection_name>/hadiths/<string:hadithNumber>", methods=["GET"])
 @single_resource
 def api_collection_hadith(collection_name, hadithNumber):
-    return Hadith.query.filter_by(collection=collection_name, hadithNumber=hadithNumber)
+    collection, book_number = resolve_collection(collection_name)
+    # `forty` numbers each of its books from 1, so order to keep the pick stable
+    query = Hadith.query.filter_by(collection=collection, hadithNumber=hadithNumber).order_by(Hadith.englishURN)
+
+    if book_number is not None:
+        query = query.filter_by(bookNumber=book_number)
+
+    return query, serialize_as(collection_name)
 
 
 @app.route("/v1/collections/<string:collection_name>/books/<string:bookNumber>/chapters", methods=["GET"])
 @paginate_results
 def api_collection_book_chapters(collection_name, bookNumber):
     book_id = Book.get_id_from_number(bookNumber)
-    return Chapter.query.filter_by(collection=collection_name, arabicBookID=book_id).order_by(Chapter.babID)
+    collection = resolve_book_collection(collection_name, book_id)
+    return Chapter.query.filter_by(collection=collection, arabicBookID=book_id).order_by(Chapter.babID)
 
 
 @app.route("/v1/collections/<string:collection_name>/books/<string:bookNumber>/chapters/<float:chapterId>", methods=["GET"])
 @single_resource
 def api_collection_book_chapter(collection_name, bookNumber, chapterId):
     book_id = Book.get_id_from_number(bookNumber)
-    return Chapter.query.filter_by(collection=collection_name, arabicBookID=book_id, babID=chapterId)
+    collection = resolve_book_collection(collection_name, book_id)
+    return Chapter.query.filter_by(collection=collection, arabicBookID=book_id, babID=chapterId)
 
 
 @app.route("/v1/hadiths", methods=["GET"])
@@ -115,7 +230,10 @@ def api_hadiths():
     # Apply filters based on query parameters
     collection = request.args.get("collection")
     if collection:
-        query = query.filter_by(collection=collection)
+        name, book_number = resolve_collection(collection)
+        query = query.filter_by(collection=name)
+        if book_number is not None:
+            query = query.filter_by(bookNumber=book_number)
 
     book_number = request.args.get("bookNumber")
     if book_number:
@@ -130,7 +248,7 @@ def api_hadiths():
         query = query.filter_by(hadithNumber=hadith_number)
 
     # Order by URN for consistent results
-    return query.order_by(Hadith.englishURN)
+    return query.order_by(Hadith.englishURN), serialize_as(collection)
 
 
 @app.route("/v1/hadiths/<int:urn>", methods=["GET"])
@@ -243,31 +361,16 @@ def api_hadiths_by_refs():
     if len(refs) > MAX_REFS:
         abort(400, f"Too many refs (max {MAX_REFS}).")
 
-    results = (
-        Hadith.query.filter(
-            or_(
-                *[
-                    and_(
-                        Hadith.collection == collection,
-                        Hadith.hadithNumber == hadith_number,
-                    )
-                    for collection, hadith_number in refs
-                ]
-            )
-        )
-        .all()
-    )
-
-    by_ref = {(h.collection, h.hadithNumber): h for h in results}
+    results = Hadith.query.filter(or_(*[ref_condition(c, n) for c, n in refs])).order_by(Hadith.englishURN).all()
 
     data = []
     missing = []
     for collection, hadith_number in refs:
-        h = by_ref.get((collection, hadith_number))
+        h = ref_match(results, collection, hadith_number)
         if h is None:
             missing.append(f"{collection}:{hadith_number}")
         else:
-            data.append(h.serialize())
+            data.append(h.serialize(**serialize_as(collection)))
 
     return jsonify({"count": len(data), "missing": missing, "data": data})
 
diff --git a/models.py b/models.py
index 7956b76..e2324c0 100644
--- a/models.py
+++ b/models.py
@@ -113,11 +113,11 @@ def get_grade(self, field_name):
         except ValueError:
             return [{"graded_by": getattr(self.rel_collection, field_name), "grade": grade_val}]
 
-    def serialize(self):
+    def serialize(self, collection=None):
         grades = {"en": self.get_grade("englishgrade1"), "ar": self.get_grade("arabicgrade1")}
 
         return {
-            "collection": self.collection,
+            "collection": collection or self.collection,
             "bookNumber": self.bookNumber,
             "chapterId": str(self.babID),
             "hadithNumber": self.hadithNumber,