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Buku Teks
Hefferon, Kate, author
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Buku Teks
Chalmers, David J.
Department of philosophy University of California, 1995
Buku Teks
Walter, Gordon A.
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Buku Teks
editor, Kirk J. Schneider, James F.T. Bugental, J. Fraser Pierson
Sage Publications, 2001
Buku Referensi