SCHAEFER, R. T. (1983). Sociology. McGraw-Hill Bo. Co.
Lua i Stíl Chicago (17ú heag.)SCHAEFER, Richard T. Sociology. New York: McGraw-Hill Bo. Co, 1983.
Lua MLA (9ú heag.)SCHAEFER, Richard T. Sociology. McGraw-Hill Bo. Co, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.