Azzouni, Jody, author
Routledge, 2000
Buku Teks
Cavaleri, Steven, author
Elsevier / Butterworth-Heinemann : Knowledge Management Consortium International Press, 2005
Buku Teks
Mackintosh, A.S.
Cambridge University Press , 1963
Buku Teks
Becker, Edward F., author
Cambridge University Press, 2012
Buku Teks
Mitze, Timo, author
[Springer, ], 2012
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