APA (7th ed.) Citation

O'Brien, G. G. (2002). The guns and flags project. University of California Press.

Chicago Style (17th ed.) Citation

O'Brien, Geoffrey G. The Guns and Flags Project. Berkeley, Calif. ; London: University of California Press, 2002.

MLA (9th ed.) Citation

O'Brien, Geoffrey G. The Guns and Flags Project. University of California Press, 2002.