Blank, Albert A., author
Houghton Miffiln, 1968
Buku Teks
Golstein, Larry J., author
Prentice-Hall, 2001
Buku Teks
Adams, William J., author
Xerox College, 1975
Buku Teks
Anton, Howard, author
John Wiley & Sons, 1980
Buku Teks
Bers, Lipman
Holt, Rinehart and winston, 1969
Buku Teks