- A Field Guide to Irish Fairies
- Encyclopedia of the Undead: A Field Guide to Creatures That Cannot Rest in Peace
- Confession: Five Sentences That Will Heal Your Life
- Lost Lands, Forgotten Realms: Sunken Continents, Vanished Cities, and the Kingdoms That History Misplaced
- Werewolves: A Field Guide to Shapeshifters, Lycanthropes, and Man-beasts