Wanting to Believe: A Critical Guide to the X-Files, Millennium and the Lone Gunmen
2009
I, Who: The Unauthorized Guide to the Doctor Who Novels
2014
I, Who 2: The Unauthorized Guide to the Doctor Who Novels and Audios
2014
I, Who 3: The Unauthorized Guide to the Doctor Who Novels and Audios
2014
About Time 5: The Unauthorized Guide to Doctor Who (Series 18 to 21)
2014
AHistory: An Unauthorized History of the Doctor Who Universe (Third Edition)
2012