Zoffer, Gerald R., author
McGraw-Hill, 1980
Buku Teks
Stutely, Richard
The Economist Books, 1992
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Myers, Danny, author
Taylor and Francis, 2009
Buku Teks
Bingham, Robert C., author
McGraw-Hill, 1987
Buku Teks
Burk, Marguerite C., author
John Wiley & Sons, 1968
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