APA (7e ed.) Bronvermelding

Ball, M. M., & Killough, H. B. (1956). International relations. Ronald Press Co.

Chicago (17e ed.) Bronvermelding

Ball, Mary Margaret, en Hugh Baxter Killough. International Relations. New York: Ronald Press Co, 1956.

MLA (9e ed.) Bronvermelding

Ball, Mary Margaret, en Hugh Baxter Killough. International Relations. Ronald Press Co, 1956.