APA (7e ed.) Bronvermelding

Boulding, K. E., & Singell, L. D. (1975). International system: Peace, conflict resolution, and politics. Colorado Associated University Press.

Chicago (17e ed.) Bronvermelding

Boulding, Kenneth Ewart, en Larry D. Singell. International System: Peace, Conflict Resolution, and Politics. Boulder, Colo: Colorado Associated University Press, 1975.

MLA (9e ed.) Bronvermelding

Boulding, Kenneth Ewart, en Larry D. Singell. International System: Peace, Conflict Resolution, and Politics. Colorado Associated University Press, 1975.