Παραπομπή APA

Johnson, D. M. (1961). Psychology: A problems solving approach. Harper & Brothers.

Παραπομπή Chicago Style

Johnson, Donald M. Psychology: A Problems Solving Approach. New York: Harper & Brothers, 1961.

Παραπομπή MLA

Johnson, Donald M. Psychology: A Problems Solving Approach. Harper & Brothers, 1961.