Cita APA (7th ed.)

Lewis, D. J. (1963). Scientific principles of psychology. Prentice - hall.

Cita Chicago (17th ed.)

Lewis, Donald J. Scientific Principles of Psychology. New Jersey: Prentice - hall, 1963.

Cita MLA (9th ed.)

Lewis, Donald J. Scientific Principles of Psychology. Prentice - hall, 1963.