Restall, Greg, author
Routledge , 2000
Buku Teks
Devlin, Keith
Chapman & Hall, 1992
Buku Teks
Wade, William R., author
Prentice-Hall, 1995
Buku Teks
Walpole, Ronald E., author
Macmillan, 1968
Buku Teks
Parzynski, William R., author
McGraw-Hill, 1987
Buku Teks