| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Solar Labyrinth: Exploring Gene Wolfe's "Book of the New Sun" | 978-0-595-31729-5 (0-595-31729-4) | 2004 |
| The Long and the Short of It: More Essays on the Fiction of Gene Wolfe | 978-0-595-38645-1 (0-595-38645-8) | 2006 |