Holt, Edwin B. (Edwin Bissell), 1873-1946
Macmillan, 1974
Buku Teks
Sturgeon, Scott, 1961-
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Buku Teks
Blackmore, Susan
Oxford University Press, 2005
Buku Teks
McGinn, Colin
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Buku Teks
Baruss, Imants
American Psychological Association, 2003
Buku Teks