Walters, Brenda L.
Upper Saddle River Prentice Hall , 1996
Buku Teks
Hansen, Mark Victor
Gramedia Pustaka Utama, 2006
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Darling, Diane
Media Global Edukasi, 2005
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Robbins, Anthony
Pustaka Delapratesa, 1996
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Adrienne, Carol
Hikmah, 2007
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