Havighurst, R. J. (1972). Developmental tasks and education (3d ed.). D. McKay Co..
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Dyfyniad Arddull Chicago
Havighurst, Robert James. Developmental Tasks and Education. 3d ed. New York: D. McKay Co., 1972.
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Dyfyniad MLA
Havighurst, Robert James. Developmental Tasks and Education. 3d ed. D. McKay Co., 1972.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.