Lewis, D. J. (1963). Scientific principles of psychology. Prentice - hall.
Chicago Style (17th ed.) ZitazioaLewis, Donald J. Scientific Principles of Psychology. New Jersey: Prentice - hall, 1963.
MLA (9th ed.) ZitazioaLewis, Donald J. Scientific Principles of Psychology. Prentice - hall, 1963.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.