The Allure of the Multiverse: Extra Dimensions, Other Worlds, and Parallel Universes

The World of Robert Jordan's The Wheel of Time

The Language of the Night: Essays on Writing, Science Fiction, and Fantasy

The Wheel of Time Companion: The People, Places, and History of the Bestselling Series

The Art Of The Lord Of The Rings By J.r.r. Tolkien

The Illustrated World of Tolkien

The Annotated Hobbit

Snape: The definitive analysis of Hogwarts's mysterious potions master (The Unofficial Harry Potter Character Series)

Stephen King's The Dark Tower Concordance

On Writing and Worldbuilding: Volume II