APA (7th ed.) Citation

Geller, D. S., & Singer , D. (1998). Nations at war: A scientific study of international conflict. Univ. Pr.

Chicago Style (17th ed.) Citation

Geller, Daniel S., and David Singer. Nations at War: A Scientific Study of International Conflict. Cambridge: Univ. Pr, 1998.

MLA (9th ed.) Citation

Geller, Daniel S., and David Singer. Nations at War: A Scientific Study of International Conflict. Univ. Pr, 1998.