Valles, Carlos G.
Jogyakarta : Kanisius, 2003,
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Mira W.
Gramedia Pustaka Utama, 2015
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Karla M. Nashar
Gramedia Pustaka Utama, 2008
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Asvi Warman Adam
Ombak , 2006
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edited by Michael Schwartz, Howard Harris, Debra R. Comer
Emerald, 2016
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