Dyfyniad APA
Pettijohn, T. F. (1992). Psychology: A concise introduction (3rd ed.). Dushkin Pub. Group.
Dyfyniad Arddull Chicago
Pettijohn, Terry F. Psychology: A Concise Introduction. 3rd ed. Guilford, Conn.: Dushkin Pub. Group, 1992.
Dyfyniad MLA
Pettijohn, Terry F. Psychology: A Concise Introduction. 3rd ed. Dushkin Pub. Group, 1992.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.