Robertson, R. N.
Cambridge University Press, 1983
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Warawut Tiyapongpattana, author
Thammasat University, 2018
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Anne T. Coughlan, Eric Anderson, Louis W. Stern, Adel El-Ansary
Prentice-Hall, 2001
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Rosenbloom, Bert, author
South Western Cengage Learning, 2012
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