APA

Nicholson J. A., . (1939). An introductory course in philosophy. New York: MacMillan.

Chicago

Nicholson J A, . 1939. An introductory course in philosophy. New York: MacMillan.

Harvard

Nicholson J. A., . (1939). An introductory course in philosophy. New York: MacMillan.

MLA

Nicholson J A, . An introductory course in philosophy. New York: MacMillan. 1939.