Bly, Robert W
Prentince Hall, 1993
Buku Teks
Swansburg, Russell C., author
Jones and Bartlett, 1990
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Thompson, Leigh L., author
Pearson - Prentice Hall, 2008
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Piccoli, Gabriele, author
John Wliley , 2012
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Siciliano, Gene, author
McGraw Hil, 2015
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