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Buku Teks
Anastasia Heni Wijayanti, author
Fakultas Psikologi Universitas Indonesia, 2001
UI - Skripsi (Membership)
Hauser, Arnold, author
Routledge & Kegan Paul, 1959
Buku Teks
Royce, James E.
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Buku Teks
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Majalah, Jurnal, Buletin