M.S. ยท M. Spiegel
| title | media type | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|---|
| The Dreaded Comparison: Human and Animal Slavery | Paperback | 978-0-9624493-3-8 (0-9624493-3-4) | 1997 |
| The Dreaded Comparison: Human and Animal Slavery | Hardcover | 978-0-9624493-1-4 (0-9624493-1-8) | 1989 |