Kovsky, Steve, author
Que Publishing, 2004
Buku Teks
Sutter, Jan, author
William Kaufmann, 1982
Buku Teks
Baglione, Lisa A., author
Thomson Wadsworth, 2007
Buku Teks
Lafosse, Michael G., author
Quarry Books, 1998
Buku Referensi
Epping, Randy Charles, author
Vintage books, 1995
Buku Teks