SCHAEFER, R. T. (1986). Sosiology Richard T. Schaefer. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)SCHAEFER, Richard T. Sosiology Richard T. Schaefer. McGraw-Hill, 1986.
Lua MLA (8ú heag.)SCHAEFER, Richard T. Sosiology Richard T. Schaefer. McGraw-Hill, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.