APA (7th ed.) Citation

Carr, H. (1926). Psychology, a study of mental activity. Longmans, Green & Co..

Chicago Style (17th ed.) Citation

Carr, Harvey. Psychology, a Study of Mental Activity. New York: Longmans, Green & Co., 1926.

MLA (9th ed.) Citation

Carr, Harvey. Psychology, a Study of Mental Activity. Longmans, Green & Co., 1926.