Carmody, Emmett J.
Oklahoma: CAD Press, c1989
Buku Teks
Hartman, William
McGraw-HIll, 1981
Buku Teks
Christou, Richard, author
Sweet & Maxwell, 2009
Buku Teks
Bethune, James D., author
Prentice-Hall, 1980
Buku Teks
editors, Harry M. Flechtner, Ronald A. Brand, Mark S. Walter
Oxford University Press, 2008
Buku Teks