Kotter, John P., 1947-, author
Harvard Business School Press, 2002
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McCalman, James
Paul Chapman Production, 1992
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Tuomi, IIkka
Metaxis, 1999
Buku Teks
Gilley, Jerry W, author
Perseus Books, 2000
Buku Teks
Gilley, Jerry W
Perseus Books, 1999
Buku Teks