Dyfyniad APA

Havighurst, R. J. (1972). Developmental tasks and education (3d ed.). D. McKay Co.

Dyfyniad Arddull Chicago

Havighurst, Robert J. Developmental Tasks and Education. 3d ed. New York: D. McKay Co, 1972.

Dyfyniad MLA

Havighurst, Robert J. Developmental Tasks and Education. 3d ed. D. McKay Co, 1972.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.