| ▲Título▼ | △C▼ | ▲Año▼ | ▲V▼ | ▲Concepto▼ |
|---|---|---|---|---|
| Call of Cthulhu 5½: Sanity (junto a Kim Eastland, Garrie Hall y Richard Watts) |   | 1992 | — | Escritor |
| Call of Cthulhu 5½: Spells (junto a Thomas Stratman) | | 1992 | — | Escritor |
| Blood on the Tracks |  | 1992 | — | Escritor |
| Breeding Ground | | 1994 | — | Escritor |
| Configurations of the Flesh | | 1996 | — | Escritor |
| Cross My Heart, Hope to Die (junto a Paul Carrick y Drashi Khendup) | | 2001 | — | Escritor |
| Dark Rivals | | 1998 | 7.00 | Escritor |
| Objective Six: Marsh Refinery | | 1997 | 8.00 | Escritor |
| Creatures of the Mythos ("Malleus Monstrorum") (junto a Marion Anderson, Scott David Aniolowski, Bruce Ballon et al.) |  | 2006 | — | Escritor |
| Creatures of the Mythos ("The Creature Companion") (junto a Scott David Aniolowski, Shannon Appelcline, Bill Barton et al.) | | 1998 | — | Escritor |
| Creatures of the Mythos ("Ye Booke of Monstres II") (junto a Phil Anderson, Marion Anderson, Bill Barton et al.) | | 1995 | — | Escritor |
| Creatures & Cultists (junto a Jeff Barber y John Tynes) |   | 1991 | — | Ilustrador |
