| ▲Título▼ | ▲C▼ | ▲Año▽ | ▲V▼ | ▲Concepto▼ |
|---|---|---|---|---|
| Deities of the Mythos (junto a Phil Anderson, Marion Anderson, Scott David Aniolowski et al.) |   | 2006 | — | Escritor |
| In Rerum Supernatura |   | 1992 | — | Escritor |
| Sourcebook for the 1920s (junto a Larry DiTillio y Keith Herber) | | 1989 | — | Escritor |
| On The Ubiquity of Cthulhu |  | 1985 | — | Escritor |
| The Kabbalistic Science of Gematria |  | 1984 | — | Escritor |
| The City Without a Name |  | 1984 | 6.00 | Escritor |
| Thoth's Dagger | | 1983 | 6.67 | Escritor |
| Further Notes on the Necronomicon |  | 1983 | — | Escritor |
| Notes on a Fragment of the Necronomicon | | 1981 | — | Escritor |
