Piaget, J. (1977). The development of thought: Equilibration of cognitive structures. Viking Press.
Chicago-viite (17. p.)Piaget, Jean. The Development of Thought: Equilibration of Cognitive Structures. New York: Viking Press, 1977.
MLA-viite (9. p.)Piaget, Jean. The Development of Thought: Equilibration of Cognitive Structures. Viking Press, 1977.
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