David, Fred R.
Merill, 1989
Buku Teks
Wright, Peter, author
Allyn and Bacon, 1992
Buku Teks
Carpenter, Mason A.
Pearson, 2007
Buku Teks
Sharplin, Arthur, author
McGraw-Hill, 1985
Buku Teks
Hunger, J. David, 1941-, author
Addison-Wesley, 1996
Buku Teks