Changed template names to fit with specifications.

ianaragoza_reading/bookshelf/urls.py

@@ -7,7 +7,7 @@ urlpatterns = [
     path('home/', home, name='home'),
     path('authors/', AuthorsView.as_view(), name='author-list'),
     path('authors/<int:pk>/details/', AuthorDetailsView.as_view(), name='author-detail'),
-    path('books/', BooksView.as_view(), name='books-list'),
+    path('books/', BooksView.as_view(), name='books'),
     path('books/<int:pk>/details/', BookDetailsView.as_view(), name='books-detail'),
 ]
 

ianaragoza_reading/bookshelf/views.py

@@ -13,15 +13,19 @@ def home(request):
 
 class BooksView(ListView):
     model = Book
+    template_name = "bookshelf/books.html"
 
 
 class BookDetailsView(DetailView):
     model = Book
+    template_name = "bookshelf/book_detais.html"
 
 
 class AuthorsView(ListView):
     model = Author
+    template_name = "bookshelf/authors.html"
 
 
 class AuthorDetailsView(DetailView):
     model = Author
+    template_name = "bookshelf/author_details.html"