APA (7th ed.) Zitazioa
Sommer, R. (2002). A practical guide to behavioral research: Tools and techniques (5th ed.). OUP.
Chicago Style (17th ed.) Zitazioa
Sommer, Robert. A Practical Guide to Behavioral Research: Tools and Techniques. 5th ed. New York: OUP, 2002.
MLA (9th ed.) Zitazioa
Sommer, Robert. A Practical Guide to Behavioral Research: Tools and Techniques. 5th ed. OUP, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.