Gary L. Lilien, editor
Edward Elgar, 2012
Buku Teks
Nickels, William G., author
McGraw-Hill, 2008
Buku Teks
Sanerya Hendrawan, author
Katholieke Universiteit Leuven, 1996
Buku Teks
Hornby, Win, author
Prentice-Hall, 2001
Buku Teks
Hurley, Morris E.
Prentice-Hall, 1956
Buku Teks