Stebben, Gregg
Pocket Books, 1999
Buku Referensi
Rosenthal, M. Sara
Contemporary Books, 2001
Buku Teks SO
Weston, J. Fred [John Fred], 1916-
McGraw-Hill, 2001
Buku Teks SO
Kaplan, Burton
Prentice-Hall, 1995
Buku Teks SO
Nierenberg, Alan H.
American Management Association, 2005
eBooks