Sommer, R. (1997). A practical guide to behavioral research: Tools and techniques (4th ed.). OUP.
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Citação norma Chicago
Sommer, Robert. A Practical Guide to Behavioral Research: Tools and Techniques. 4th ed. New York: OUP, 1997.
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Citação norma MLA
Sommer, Robert. A Practical Guide to Behavioral Research: Tools and Techniques. 4th ed. OUP, 1997.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.