APA

Conference Life-span Developmental Psychology psychology (4ª : 1974 : West Virginia University), . (1975). Life-span developmental psychology : normative life crises. New York: Academic Press.

Chicago

Conference Life-span Developmental Psychology psychology (4ª : 1974 : West Virginia University), . 1975. Life-span developmental psychology : normative life crises. New York: Academic Press.

Harvard

Conference Life-span Developmental Psychology psychology (4ª : 1974 : West Virginia University), . (1975). Life-span developmental psychology : normative life crises. New York: Academic Press.

MLA

Conference Life-span Developmental Psychology psychology (4ª : 1974 : West Virginia University), . Life-span developmental psychology : normative life crises. New York: Academic Press. 1975.