Schaefer, R. T. (2007). Sociology (10th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Schaefer, Richard T. Sociology. 10th ed. Boston: McGraw-Hill, 2007.
Lua MLA (8ú heag.)Schaefer, Richard T. Sociology. 10th ed. McGraw-Hill, 2007.
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