Anderson, David Ray, 1941-, author
Thomson South-Western, 2008
Multimedia
edited by R.G.D. Allen and J. Edward Ely
John Wiley & Sons, 1953
Buku Teks
Barrow, Mike, author
Prentice-Hall, 2001
Buku Teks
Barrow, Michael, author
Longman , 1997
Buku Teks
Bradley, Iver E., author
Dryden Press, 1981
Buku Teks