Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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