Creaciones
| ▲Título▼ | ▲C▽ | ▲Año▼ | ▲V▼ | ▲Concepto▼ |
|---|
| Introduction (to "Malleus Monstrorum") |   | 2006 | — | Escritor |
| Foreword ("Malleus Monstrorum") | | 2004 | — | Escritor |
| The Dreamlands Bestiary (junto a K.L. Campbell-Robson, Larry DiTillio, Phil Frances et al.) | | 1997 | — | Escritor |
| Deities of the Mythos ("The Creature Companion") (junto a Phil Anderson, Marion Anderson, Shannon Appelcline et al.) | | 1998 | — | Escritor |
| Deities of the Mythos ("Malleus Monstrorum") (junto a Phil Anderson, Marion Anderson, Bruce Ballon et al.) | | 2006 | — | Escritor |
| Cthulhu Mythos Entities in Victorian Britain (junto a David Grilla) | | 2012 | — | Escritor |
| Creatures of the Mythos ("The Creature Companion") (junto a Shannon Appelcline, Bill Barton, Fred Behrendt et al.) | | 1998 | — | Escritor |
| Creatures of the Mythos ("Malleus Monstrorum") (junto a Marion Anderson, Bruce Ballon, Bill Barton et al.) | | 2006 | — | Escritor |
| Creatures of the Mythos ("Call of Cthulhu 5th Edition") (junto a Sandy Petersen y Lynn Willis) | | 1992 | — | Escritor |
| Creatures of the Mythos ("Ye Booke of Monstres") (junto a Fred Behrendt, John Carnahan, Larry DiTillio et al.) | | 1994 | — | Escritor |
| Creatures of Legend & Folklore (junto a Sandy Petersen, Justin Schmid y Lynn Willis) | | 2006 | — | Escritor |
| The Campbell Mythos (junto a Drashi Khendup) | | 2001 | — | Escritor |
| Campbell Country (junto a Paul Carrick, Drashi Khendup y Gary Sumpter) | | 2001 | — | Escritor |
| Beasts and Monsters ("Call of Cthulhu 5th Edition") (junto a Sandy Petersen y Lynn Willis) | | 1992 | — | Escritor |
| Appendix (to "The Compact Trail of Tsathoggua") | | 1997 | — | Escritor |
| Animals (junto a Marion Anderson, Sandy Petersen, Justin Schmid y Lynn Willis) | | 2006 | — | Escritor |
| Alien Races (junto a Keith Herber) | | 1993 | — | Escritor |
| About Monstres | | 1994 | — | Escritor |
| The Windthrope Legacy (junto a Paul Carrick y Drashi Khendup) |  | 2001 | — | Escritor |
| The Whore of Baharna | | 1993 | 4.00 | Escritor |
| Where A God Shall Tread (junto a Earl Geier, Keith Herber y Lynn Willis) | | 1990 | — | Escritor |
| Unpleasant Dreams (junto a Paul Carrick, Drashi Khendup y Gary Sumpter) | | 2001 | — | Escritor |
| Trick or Treat | | 1990 | — | Escritor |
| The Trail of Tsathoggua | | 1997 | — | Escritor |
Think Tank  | | 1994 | — | Escritor |
