APA

Phelps H. A., . (1936). Principles and laws of sociology. New York: Wiley.

Chicago

Phelps Harold Augustine, . 1936. Principles and laws of sociology. New York: Wiley.

Harvard

Phelps H. A., . (1936). Principles and laws of sociology. New York: Wiley.

MLA

Phelps Harold Augustine, . Principles and laws of sociology. New York: Wiley. 1936.