Frost, Raymond, 1960-
Pearson Prentice Hall, 2001
Buku Teks SO
Evans, Joyce J.
John Wiley & Sons, 2003
Buku Teks
Williams, Robin
Peachpit Press, 2000
Buku Teks SO
Ullman, Larry
Peachpit Press, 2008
Buku Teks SO
Willard, Wendy
Osborne/McGraw-Hill, 2001
Buku Referensi