Brown, John, 1923-, author
English Language Book Society , 1974
Buku Teks
Schermerhorn, John R., author
John Wiley & Sons, 1996
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Hunt, Alfred
N.Y. John Wiley & Sons , 1977
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Henderson, Ian, author
Doubleday, 1958
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Buckley, John, author
MPG Books Limited, 2003
Buku Teks