Liebert, R. M., & Poulos, R. W. (1977). Developmental psychology (4th ed.). Prentice-Hall.
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Dyfyniad Arddull Chicago
Liebert, Robert M., and Rita Wicks Poulos. Developmental Psychology. 4th ed. New Jersey: Prentice-Hall, 1977.
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Dyfyniad MLA
Liebert, Robert M., and Rita Wicks Poulos. Developmental Psychology. 4th ed. Prentice-Hall, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.