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"Jean Piaget." Infoplease. Infoplease.com, n.d. Web. 12 Sept. 2012.
"Piaget, Jean (1896-1980)." The McGraw-Hill Encyclopedia of Science & Technology Online.
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"Jean Piaget." Infoplease. Infoplease.com, n.d. Web. 12 Sept. 2012.
"Piaget, Jean (1896-1980)." The McGraw-Hill Encyclopedia of Science & Technology Online.
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