Frankfort-Nachmias, C. (1992). Research methods in the social sciences: 576pp (4th ed.). St.Martin's Press.
Lua i Stíl Chicago (17ú heag.)Frankfort-Nachmias, Chava. Research Methods in the Social Sciences: 576pp. 4th ed. New York: St.Martin's Press, 1992.
Lua MLA (9ú heag.)Frankfort-Nachmias, Chava. Research Methods in the Social Sciences: 576pp. 4th ed. St.Martin's Press, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.