Title: The Lexicon: An Unauthorized Guide to Harry Potter Fiction and Related Materials, Author: Steve Vander Ark
Title: The Sorcerer's Companion: A Guide to the Magical World of Harry Potter, Third Edition, Author: Allan Zola Kronzek
Title: Harry, A History: The True Story of a Boy Wizard, His Fans, and Life Inside the Harry Potter Phenomenon, Author: Melissa Anelli
Title: The End of Harry Potter?, Author: David Langford