Vander Zanden, J. (1989). Human development (4th ed.). Alfred.A.Knopf.
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Dyfyniad Arddull Chicago
Vander Zanden, James.W. Human Development. 4th ed. New York: Alfred.A.Knopf, 1989.
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Dyfyniad MLA
Vander Zanden, James.W. Human Development. 4th ed. Alfred.A.Knopf, 1989.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.