Fertakis, John P., author
Quorum Books, 1988
Buku Teks
Morrow, Vincent, author
Prentice-Hall, 1991
Buku Referensi
Gup, Benton E., author
Richard D. Irwin, 1996
Buku Referensi
editor, Brian J. Terry
Toppan Company, 1997
Buku Referensi
edited by Mike Wright, Donald S. Siegel, Kevin Keasey and Igor Filatotchev
Oxford University Press, 2014
Buku Referensi