Não informado. (1953). Nebraska Symposium on Motivation. University of Nebraska, Department of Psychology.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Nebraska Symposium on Motivation. Lincoln, Neb: University of Nebraska, Department of Psychology, 1953.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Nebraska Symposium on Motivation. University of Nebraska, Department of Psychology, 1953.
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