Creaciones
| ▲Título▼ | ▲C▼ | △Año▼ | ▲V▼ | ▲Concepto▼ |
|---|
| Unpleasant Dreams (junto a Paul Carrick, Drashi Khendup y Gary Sumpter) |   | 2001 | — | Escritor |
| The Windthrope Legacy (junto a Paul Carrick y Drashi Khendup) | | 2001 | — | Escritor |
| Foreword ("Malleus Monstrorum") |  | 2004 | — | Escritor |
| Animals (junto a Marion Anderson, Sandy Petersen, Justin Schmid y Lynn Willis) | | 2006 | — | Escritor |
| Creatures of Legend & Folklore (junto a Sandy Petersen, Justin Schmid y Lynn Willis) | | 2006 | — | Escritor |
| Creatures of the Mythos ("Malleus Monstrorum") (junto a Marion Anderson, Bruce Ballon, Bill Barton et al.) | | 2006 | — | Escritor |
| Deities of the Mythos ("Malleus Monstrorum") (junto a Marion Anderson, Phil Anderson, Bruce Ballon et al.) | | 2006 | — | Escritor |
| Introduction (to "Malleus Monstrorum") | | 2006 | — | Escritor |
| Shades of Tomorrow Lost (junto a Jason C. Eckhardt) | | 2010 | — | Escritor |
| Coach Chase Rules (junto a Kevin Ross) |  | 2012 | — | Escritor |
| Cthulhu Mythos Entities in Victorian Britain (junto a David Grilla) | | 2012 | — | Escritor |
| Jack the Ripper (junto a Kevin Ross) | | 2012 | — | Escritor |
| Victorian Fictional Characters (junto a Kevin Ramos, Kevin Ross y John T. Snyder) | | 2012 | — | Escritor |
| Értóng hé Küqì de Mûqïn (The Child and the Weeping Mother) (junto a Tom Lynch) | | 2013 | — | Escritor |
| Introduction (to "Tales of the Sleepless City") | | 2013 | — | Escritor |
| Massa di Requiem per Shuggay: A History of The Devil’s Opera | | 2013 | — | Escritor |
| Massa di Requiem per Shuggay |   | 2014 | — | Escritor |
| Cold Warning | | 2017 | — | Escritor |
| The Supernatural West (junto a Chad J. Bowser, David Cole, Stéphane Gesbert et al.) | | 2017 | — | Escritor |
