Não informado. (1976). Essence. York University, Atkinson College, Department of Psychology.
Citace podle Chicago (17th ed.)Não informado. Essence. Ontario, Canada: York University, Atkinson College, Department of Psychology, 1976.
Citace podle MLA (8th ed.)Não informado. Essence. York University, Atkinson College, Department of Psychology, 1976.
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