Fred N. Kerlinger. (1964). Foundations of behavioral research, 2nd ed. Holt Rinehart and Winston.
Lua i Stíl Chicago (17ú heag.)Fred N. Kerlinger. Foundations of Behavioral Research, 2nd Ed. New York: Holt Rinehart and Winston, 1964.
Lua MLA (9ú heag.)Fred N. Kerlinger. Foundations of Behavioral Research, 2nd Ed. Holt Rinehart and Winston, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.