Havighurst, R. J. (1972). Developmental tasks and education (3rd ed.). Longmans.
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Chicago-čujuhus (17. p.)
Havighurst, Robert J. Developmental Tasks and Education. 3rd ed. New York: Longmans, 1972.
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MLA-čujuhus (9. p.)
Havighurst, Robert J. Developmental Tasks and Education. 3rd ed. Longmans, 1972.
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