- Author: Stephen Harrison, Gesine Manuwald, William M. Barton, Bobby Xinyue
- Language: English
- Year: 2023
- Author: William M. Barton
- Language: English
- Year: 2018
- Author: Gesine Manuwald, Bobby Xinyue, Daniel Hadas, Lucy R. Nicholas, Stephen J. Harrison, William M. Barton
- Language: English
- Year: 2020
Cthulhu Casebook
pdf
- Author: William A Barton Hamblin Hargrave Mark Harmon Randy McCall
- Language: English
- Year: 1990
- Author: William A. Barton
- Language: English
- Year: 1988
GURPS Space: Roleplaying in the Worlds of Tomorrow (GURPS: Generic Universal Role Playing System)
pdf
- Author: Steve Jackson William A. Barton
- Language: English
- Year: 1994