| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2003 | 978-0-9723013-0-5 | Louis A. Berman | The Puzzle: Exploring the Evolutionary Puzzle of Male Homosexuality |
| '' | 978-0-9723013-1-2 | Louis A. Berman | The Puzzle: Exploring the Evolutionary Puzzle of Male Homosexuality |