Dyfyniad APA

De Vaus, D. (2002). Surveys in social research (5th ed.). Routledge.

Dyfyniad Arddull Chicago

De Vaus, David. Surveys in Social Research. 5th ed. London: Routledge, 2002.

Dyfyniad MLA

De Vaus, David. Surveys in Social Research. 5th ed. Routledge, 2002.

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