APA (7th ed.) Citation

Bulmahn, J. (2009). Pathfinder roleplaying game: GM screen. Paizo Publishing.

Chicago Style (17th ed.) Citation

Bulmahn, Jason. Pathfinder Roleplaying Game: GM Screen. [Redmond, Wash.]: Paizo Publishing, 2009.

MLA (9th ed.) Citation

Bulmahn, Jason. Pathfinder Roleplaying Game: GM Screen. Paizo Publishing, 2009.