Cozby, P. C. (1985). Methods in behavioral research (3rd.ed.). Mayfield.
Lua i Stíl Chicago (17ú heag.)Cozby, Paul C. Methods in Behavioral Research. 3rd.ed. Palo Alto: Mayfield, 1985.
Lua MLA (9ú heag.)Cozby, Paul C. Methods in Behavioral Research. 3rd.ed. Mayfield, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.