Schuller, Robert H., author
Gunung Mulia, 1986
Buku Teks
Walters, Brenda L., author
Upper Saddle River Prentice Hall , 1996
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Hansen, Mark Victor, author
Gramedia Pustaka Utama, 2006
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Darling, Diane, author
Media Global Edukasi, 2005
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Robbins, Anthony, author
Pustaka Delapratesa, 1996
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