Piaget, J., Piercy, M., & Berlyne, D. E. (2001). The psychology of intelligence. Routledge.
Lua i Stíl Chicago (17ú heag.)Piaget, Jean, Malcolm Piercy, agus D. E. Berlyne. The Psychology of Intelligence. London: Routledge, 2001.
Lua MLA (9ú heag.)Piaget, Jean, et al. The Psychology of Intelligence. Routledge, 2001.
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