diff --git a/fastapi_book_server/app/models.py b/fastapi_book_server/app/models.py
index 1c58ed5..23edf09 100644
--- a/fastapi_book_server/app/models.py
+++ b/fastapi_book_server/app/models.py
@@ -140,6 +140,13 @@ class Book(ormar.Model):
     genres = ormar.ManyToMany(Genre, through=BookGenres)
     sequences = ormar.ManyToMany(Sequence, through=BookSequences)
 
+    @ormar.property_field
+    def available_types(self) -> list[str]:
+        if self.file_type == 'fb2' and self.source.name == 'flibusta':
+            return ['fb2', 'epub', 'mobi']
+
+        return [self.file_type]
+
 
 class BookAnnotation(ormar.Model):
     class Meta(BaseMeta):
diff --git a/fastapi_book_server/app/serializers/book.py b/fastapi_book_server/app/serializers/book.py
index 8b759ab..088d300 100644
--- a/fastapi_book_server/app/serializers/book.py
+++ b/fastapi_book_server/app/serializers/book.py
@@ -10,6 +10,7 @@ class Book(BaseModel):
     title: str
     lang: str
     file_type: str
+    available_types: list[str]
     uploaded: date
     authors: list[Author]
 
diff --git a/fastapi_book_server/app/services/book.py b/fastapi_book_server/app/services/book.py
index 52b8e99..cae5759 100644
--- a/fastapi_book_server/app/services/book.py
+++ b/fastapi_book_server/app/services/book.py
@@ -13,7 +13,7 @@ class BookTGRMSearchService(TRGMSearchService):
     FIELDS = [
         BookDB.Meta.table.c.title
     ]
-    PREFETCH_RELATED = ["source"]
+    PREFETCH_RELATED = ["source", "authors"]
     FILTERS = [
         BookDB.Meta.table.c.is_deleted == False,
     ]
diff --git a/fastapi_book_server/app/views/book.py b/fastapi_book_server/app/views/book.py
index 53650e8..53264ad 100644
--- a/fastapi_book_server/app/views/book.py
+++ b/fastapi_book_server/app/views/book.py
@@ -22,7 +22,7 @@ book_router = APIRouter(
 @book_router.get("/", response_model=CustomPage[Book], dependencies=[Depends(Params)])
 async def get_books():
     return await paginate(
-        BookDB.objects.select_related("authors")
+        BookDB.objects.select_related(["source",  "authors"])
     )
 
 
@@ -30,12 +30,12 @@ async def get_books():
 async def create_book(data: Union[CreateBook, CreateRemoteBook]):
     book = await BookCreator.create(data)
 
-    return await BookDB.objects.select_related("authors").get(id=book.id)
+    return await BookDB.objects.select_related(["source",  "authors"]).get(id=book.id)
 
 
 @book_router.get("/{id}", response_model=Book)
 async def get_book(id: int):
-    book = await BookDB.objects.select_related("authors").get_or_none(id=id)
+    book = await BookDB.objects.select_related(["source",  "authors"]).get_or_none(id=id)
     
     if book is None:
         raise HTTPException(status.HTTP_404_NOT_FOUND)
@@ -45,7 +45,7 @@ async def get_book(id: int):
 
 @book_router.get("/remote/{source_id}/{remote_id}", response_model=Book)
 async def get_remote_book(source_id: int, remote_id: int):
-    book = await BookDB.objects.select_related("authors").get_or_none(
+    book = await BookDB.objects.select_related(["source",  "authors"]).get_or_none(
         source=source_id,
         remote_id=remote_id
     )
@@ -58,7 +58,7 @@ async def get_remote_book(source_id: int, remote_id: int):
 
 @book_router.put("/{id}", response_model=Book)
 async def update_book(id: int, data: UpdateBook):
-    book = await BookDB.objects.select_related("authors").get_or_none(id=id)
+    book = await BookDB.objects.select_related(["source",  "authors"]).get_or_none(id=id)
 
     if book is None:
         raise HTTPException(status.HTTP_404_NOT_FOUND)