Ritzer, G., & Goodman, D. (2004). Sociology theory (6th ed.). McGraw - Hill.
Lua i Stíl Chicago (17ú heag.)Ritzer, George, agus Douglas Goodman. Sociology Theory. 6th ed. Boston: McGraw - Hill, 2004.
Lua MLA (9ú heag.)Ritzer, George, agus Douglas Goodman. Sociology Theory. 6th ed. McGraw - Hill, 2004.
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