Angresano, James, author
Prentice-Hall, 1991
Buku Teks
Rosser, J. Barkley, author
McGraw-Hill, 1996
Buku Teks
Blodgett, Ralp H., author
Macmillan, 1949
Buku Teks
Gregory, Paul R., author
Hougton Mifflin, 1985
Buku Teks
Halm, George N., author
Feffer and Simons, 1971
Buku Teks