Mendenhall, William, author
Duxbury Press, 1981
Buku Teks
Devore, Jay L, author
[Springer, ], 2012
eBooks
Kapadia, Asha Seth, author
Chapman & Hall/CRC, 2005
Buku Teks
Freund, John E., author
Prentice-Hall, 1980
Buku Teks
Larsen, Richard J.
Prentice-Hall, 1996
Buku Teks