Παραπομπή APA

Goertz, G., Diehl, P. F., & Balas, A. (2016). The puzzle of peace: The evolution of peace in the international system. Oxford University Press.

Παραπομπή Chicago Style

Goertz, Gary, Paul F. Diehl, και Alexandru Balas. The Puzzle of Peace: The Evolution of Peace in the International System. New York: Oxford University Press, 2016.

Παραπομπή MLA

Goertz, Gary, et al. The Puzzle of Peace: The Evolution of Peace in the International System. Oxford University Press, 2016.