| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The Explorers Ltd. Source book | 978-0-06-011252-3 (0-06-011252-2) | 1977 |
| The Explorers Ltd. Source Book | 978-0-06-011259-2 (0-06-011259-X) | 1977 |
| The Explorers Ltd. source book | 978-0-06-011221-9 (0-06-011221-2) | 1973 |