| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1996 | 978-0-9651776-0-3 | Cynthia Attar | The Mule Companion: Essential Mule Wisdom |
| 1998 | 978-0-9651776-1-0 | '' | The Mule Companion: A Guide to Understanding the Mule |
| 2009 | 978-0-9651776-5-8 | '' | The Mule Companion: A Guide to Understanding the Mule |