Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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