Lua APA (7ú heag.)

Babbie, E. (2004). The Practice of Social Research (10th.). Thomson Learning.

Lua i Stíl Chicago (17ú heag.)

Babbie, Earl. The Practice of Social Research. 10th. Singapore: Thomson Learning, 2004.

Lua MLA (9ú heag.)

Babbie, Earl. The Practice of Social Research. 10th. Thomson Learning, 2004.

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