Williamson, E. G., Cowan, J. L., Crawford, R. G., & Willems, V. (1966). The American student's freedom of expression: A research appraisal. University of Minnesota Press.
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Citação norma Chicago
Williamson, E. G., John L. Cowan, R. George Crawford, and Virginia Willems. The American Student's Freedom of Expression: A Research Appraisal. Minneapolis: University of Minnesota Press, 1966.
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Citação norma MLA
Williamson, E. G., et al. The American Student's Freedom of Expression: A Research Appraisal. University of Minnesota Press, 1966.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.