APA-referens (7:e uppl.)

Johnson, D. M. (1948). Essentials of psychology: An introductory textbook. McGraw-Hill Book Co.

Chicago-referens (17:e uppl.)

Johnson, Donald McEwen. Essentials of Psychology: An Introductory Textbook. New York: McGraw-Hill Book Co, 1948.

MLA-referens (9:e uppl.)

Johnson, Donald McEwen. Essentials of Psychology: An Introductory Textbook. McGraw-Hill Book Co, 1948.