APA (7th ed.) Citation

Zeigler, J. F., Cambias, J. L., & Upchurch, W. (2006). GURPS space (4th ed.). Steve Jackson Games.

Chicago Style (17th ed.) Citation

Zeigler, Jon F., James L. Cambias, and Wil Upchurch. GURPS Space. 4th ed. [Austin, Tex.]: Steve Jackson Games, 2006.

MLA (9th ed.) Citation

Zeigler, Jon F., et al. GURPS Space. 4th ed. Steve Jackson Games, 2006.