Moorehead, Alan, author
Penguin Books, 1966
Buku Teks
Perkins, Dennis N.T., author
[American Management Association, ], 2000
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Lebedev, I.
MIR Publishers , 1973
Buku Teks
Go, Kyeong-nam, author
Booksenseu, 2007
Buku Teks
Hemmerechts, Kristien, author
Atlas, 2004
Buku Teks