Peale, Norman Vincent, 1898-1993, author
Binarupa Aksara, 1993
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Deacy, Christopher, author
Blackwell Publishing, 2008
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Maxwell, John C., author
Binarupa Aksara, 1996
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Purba, Melina, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Skripsi (Membership)
Salto Deodatus S., author
OBOR, 2021
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