Havighurst, R. J. (1972). Development tasks and education (3rd ed.). David McKay Company, Inc..
Chicago (17e ed.) BronvermeldingHavighurst, Robert James. Development Tasks and Education. 3rd ed. New york: David McKay Company, Inc., 1972.
MLA (8e ed.) BronvermeldingHavighurst, Robert James. Development Tasks and Education. 3rd ed. David McKay Company, Inc., 1972.
Let op: Deze citaties zijn niet altijd 100% accuraat.