Robertson, I. (1987). Sociology (3rd ed.). Worth publishers.
Lua i Stíl Chicago (17ú heag.)Robertson, Ian. Sociology. 3rd ed. New York: Worth publishers, 1987.
Lua MLA (9ú heag.)Robertson, Ian. Sociology. 3rd ed. Worth publishers, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.