Blanchard, Paul, author
Brooks/Cole, 1996
Buku Teks
Ross, Shepley L., author
McGraw-Hill, 1984
Buku Teks
Ross, Shepley L., author
Xerox College Publishing, 1964
Buku Teks
Rainville, Earl D.
Macmillan, 1981
Buku Teks
Strum, Robert D., author
Prentice-Hall, 1968
Buku Teks