Havighurst, R. J. (1972). Development tasks and education (3rd ed.). David McKay Company, Inc..
Citazione stile Chigago Style (17a edizione)Havighurst, Robert James. Development Tasks and Education. 3rd ed. New york: David McKay Company, Inc., 1972.
Citatione MLA (8a ed.)Havighurst, Robert James. Development Tasks and Education. 3rd ed. David McKay Company, Inc., 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.