Taylor, Weldon Johnson, 1908-
South-Western, 1975
Buku Teks
Parkinson, C. Northcote (Cyril Northcote), 1909-1993, author
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Buku Teks
Etzel, Michael J., author
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Buku Teks
Kerin, Roger A., author
The McGraw-Hill, 2003
Multimedia
Phillips, Charles F., author
Boston , Houghton Mifflin
Buku Teks