APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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