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Buku Teks
Hutabarat, Hernes, author
Fakultas Psikologi Universitas Indonesia, 2006
UI - Tesis (Membership)
edited by Michael R. Dove
University of Hawaii Press, 1988
Buku Teks
N.Y. Pantheon Books , 1979
Buku Teks
Clark, Peter A., author
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Buku Teks