Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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