DeCoursey, Rusell Myles
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Buku Teks
Silverthorn, Dee Unglaub
Pearson, Benjamin Cummings, 2010
Buku Teks
Shier, David
McGraw-Hill, 2004
Buku Teks
Patton, Kevin T.
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Buku Referensi
Shier, David
McGraw-HIll. , 2001
Buku Teks