Psychology : a study of mental activity

MLA

Carr, Harvey A. Psychology : a Study of Mental Activity. New York [etc.]: Longmans, Green, and co., 1925.

APA

Carr, H. A. (1925). Psychology : a study of mental activity. New York [etc.]: Longmans, Green, and co.

Chicago

Carr, Harvey A., Psychology: A Study of Mental Activity. New York [etc.]: Longmans, Green, and co., 1925.