Park, R. E. The Nature of Race Relations: Robert E. Park. Theories of race and racism : a reader.(2003).
Lua i Stíl Chicago (17ú heag.)Park, Robert E. "The Nature of Race Relations: Robert E. Park." Theories of Race and Racism : A Reader.(2003) .
Lua MLA (8ú heag.)Park, Robert E. "The Nature of Race Relations: Robert E. Park." Theories of Race and Racism : A Reader.(2003), .
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