Lua APA (7ú heag.)

Freedman, R. (1952). Principles of sociology: A text readings. Holt.

Lua i Stíl Chicago (17ú heag.)

Freedman, Ronald. Principles of Sociology: A Text Readings. New York: Holt, 1952.

Lua MLA (9ú heag.)

Freedman, Ronald. Principles of Sociology: A Text Readings. Holt, 1952.

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