These were published by Dark Horse, originally in comic format but then gathered into volumes of trade paperbacks.
This comprises an anthology of short stories written by Joss Whedon, Jane Espenson, and other writers of the Buffy TV shows.
This is an anthology of short stories written by Joss Whedon, Jane Espenson, and others.
There has been a sexually explicit satirical graphic novel, Boffy the Vampire Layer, which is not officially licensed as Buffy merchandise by 20th Century Fox.
However, unlike fanfiction, overviews summarizing their story, written early in the writing process, were "approved" by both Fox and Joss Whedon (or his office), and the books were therefore later published as official Buffy merchandise.