Cita APA (7th ed.)
Pettijohn, T. F. (1992). Psychology: A concise introduction (3rd ed.). Dushkin Pub. Group.
Cita Chicago (17th ed.)
Pettijohn, Terry F. Psychology: A Concise Introduction. 3rd ed. Guilford, Conn.: Dushkin Pub. Group, 1992.
Cita MLA (9th ed.)
Pettijohn, Terry F. Psychology: A Concise Introduction. 3rd ed. Dushkin Pub. Group, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.