edited by Vas Prabhu and Malcolm Baker
McGraw-Hill, 1986
Buku Teks
Becker, Brian E.
Harvard Bussines School Press, 2001
Buku Teks
Weske, Mathias
[, Springer-Verlag], 2012
eBooks
Allen, Jane Elizabeth
Addison-Wesley, 1987
Buku Teks
Muhammad Fadil
2013
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