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Gramedia, 2006
Buku Teks
Sukaria, author
1995
UI - Skripsi (Membership)
Butarbutar, Tiodora Br., author
Fakultas Psikologi Universitas Indonesia, 2004
UI - Skripsi (Membership)
Canfield, Jack, 1944-, author
Gramedia, 2003
Buku Teks
Canfield, Jack, 1944-, author
Gramedia, 2003
Buku Teks