APA (7th ed.) Citation

Phelps, H. A. (1938). Contemporay social problems. Prentice-Hall.

Chicago Style (17th ed.) Citation

Phelps, Harold Augustus. Contemporay Social Problems. New York: Prentice-Hall, 1938.

MLA (9th ed.) Citation

Phelps, Harold Augustus. Contemporay Social Problems. Prentice-Hall, 1938.