Singer, Erwin
Random House, 1965
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Totok S. Wiryasaputra
Pustaka Referensi , 2019
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Brent D. Slife, Richard N. Williams, and Sally H. Barlow
Sage, 2001
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Whitaker, Carl A.
The Blakiston Company, 1953
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Bateman, Anthony
Brunner-Routledge, 2003
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