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Twelve, 2011
Buku Teks
Foskett, Nicholas, author
Routledge, 2001
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Ita Satyaningrum, author
1989
UI - Skripsi (Membership)
Alfatiane Putrini, author
Fakultas Psikologi Universitas Indonesia, 2002
UI - Skripsi (Membership)
Fakultas Psikologi Universitas Indonesia, 2003
UI - Skripsi (Membership)