Koller, Tim
John Wiley & Sons, 2010
Buku Teks SO
Hoag, Bruce
Edward Elgar, 2006
Buku Teks
Arthur, Diane
American Management Association, 1995
eBooks
Smith, George Albert
Harvard University, Graduate School of Business Administration, Division of Research, 1958
Buku Teks SO
Lundholm, Russell James
McGraw-Hill , 2001
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