Kopacz, Jeanne, author
McGraw-Hill, 2004
Buku Teks
Simmons, Christopher, 1973-, author
Rockport, 2006
Buku Referensi
Peterson, L. K., author
Rockport Publishers, 2000
Buku Teks
Boyle, Cailin, author
Rockport Publishers, 2001
Buku Teks
Alexander, Kathie
Rockport Publishers, Inc., 2010
Buku Referensi