Spiegel, Murray R., author
McGraw-Hill, 1982
Buku Teks
edited by Jagdishi S. Rustagi
Academic Press, 1979
Buku Teks
Dudewicz, Edward J., author
ITB Press, 1995
Buku Teks
Larsen, Richard J.
Prentice-Hall, 1996
Buku Teks
Mendenhall, William, author
Wadsworth , 1967
Buku Teks