APA (7th ed.) Citation

Swain, J. W., & Armstrong, W. H. (1959). The peoples of the ancient world. Harper.

Chicago Style (17th ed.) Citation

Swain, Joseph Ward, and William Howard Armstrong. The Peoples of the Ancient World. New York: Harper, 1959.

MLA (9th ed.) Citation

Swain, Joseph Ward, and William Howard Armstrong. The Peoples of the Ancient World. Harper, 1959.