Lua APA (7ú heag.)

Babbie, E. R. (2007). The practice of social research (Eleventh edition.). Thomson/Wadsworth.

Lua i Stíl Chicago (17ú heag.)

Babbie, Earl R. The Practice of Social Research. Eleventh edition. Australia: Thomson/Wadsworth, 2007.

Lua MLA (9ú heag.)

Babbie, Earl R. The Practice of Social Research. Eleventh edition. Thomson/Wadsworth, 2007.

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