| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 1996 | 978-0-9649983-3-9 | Billy L. Farmer ยท B.L. Falmer | Universe Alternatives: Emerging Concepts of Size, Age, Structure and Behavior |
| 1997 | 978-0-9649983-4-6 | Billy L. Farmer | Universe Alternatives: Emerging Concepts of Size, Age, Structure and Behavior |