Francois, William E.
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Buku Teks
Agee, Warren Kendall, editor
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Buku Teks
Emery, Edwin, editor
Dood, Mead & Company, 1971
Buku Teks
Biagi, Shirley, author
Wadsworth and Cengage Learning, 2012
Buku Teks
Biagi, Shirley, author
Cengage Learning, 2015
Buku Teks