Piaget, J. (1929). The child's conception of the world. Routledge & K. Paul.
Lua i Stíl Chicago (17ú heag.)Piaget, Jean. The Child's Conception of the World. London: Routledge & K. Paul, 1929.
Lua MLA (9ú heag.)Piaget, Jean. The Child's Conception of the World. Routledge & K. Paul, 1929.
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