Di Pietro, Robert J.
Cambridge University Press, 1994
Buku Teks
Heijden, Kees van der
John Wiley & Sons, 1996
Buku Teks
Ringland, Gill
John Wiley & Sons, 2002
Buku Teks
Hale, Tammy J.
Delmar, 2011
Buku Teks
Mintzberg, Henry
Prentice-Hall, 1998
Buku Teks