Schaefer, R. T., 1940- 1950- 1949- 1951- 1963- 1953-, & 1950- 1963-. (2011). Sociology: A brief introduction (9th ed.). New York: McGraw-Hill.
Trích dẫn kiểu ChicagoSchaefer, Richard T., 1940- 1950- 1949- 1951- 1963- 1953-, và 1950- 1963-. Sociology: A Brief Introduction. 9th ed. New York: McGraw-Hill, 2011.
Deismireacht MLASchaefer, Richard T., 1940- 1950- 1949- 1951- 1963- 1953-, và 1950- 1963-. Sociology: A Brief Introduction. 9th ed. New York: McGraw-Hill, 2011.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.