Dyfyniad APA

Havighurst, R. J. (1972). Development tasks and education (3rd ed.). David McKay Company, Inc..

Dyfyniad Arddull Chicago

Havighurst, Robert James. Development Tasks and Education. 3rd ed. New york: David McKay Company, Inc., 1972.

Dyfyniad MLA

Havighurst, Robert James. Development Tasks and Education. 3rd ed. David McKay Company, Inc., 1972.

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