Fenson, L. (1990). Human development 90/91 (18ª ed.). The Dushkin.
Chicago-čujuhus (17. p.)Fenson, Larry. Human Development 90/91. 18ª ed. The Dushkin, 1990.
MLA-čujuhus (9. p.)Fenson, Larry. Human Development 90/91. 18ª ed. The Dushkin, 1990.
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