Lefton, L. A., & Valvatne, L. (1986). Mastering Psychology (2nd ed.). Allyn & Bacon.
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Dyfyniad Arddull Chicago
Lefton, Lester A., and Laura Valvatne. Mastering Psychology. 2nd ed. Boston: Allyn & Bacon, 1986.
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Dyfyniad MLA
Lefton, Lester A., and Laura Valvatne. Mastering Psychology. 2nd ed. Allyn & Bacon, 1986.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.