Schaefer, R. T. (2005). Sociology (9th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Schaefer, Richard T. Sociology. 9th ed. Boston: McGraw-Hill, 2005.
Lua MLA (9ú heag.)Schaefer, Richard T. Sociology. 9th ed. McGraw-Hill, 2005.
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