Howell, Rate A., author
Dryden Press, 1984
Buku Teks
Clark, Lawrence S., author
McGraw-Hill, 1991
Buku Teks
Braucher, Robert, author
Foundation Press, 1964
Buku Teks
Twomey, David P., author
Thomson Learning, 2002
Buku Teks
Lavine, A. Lincoln
Prentice-Hall, 1963
Buku Teks