Davenport, Dawn, author
Broadway Books, 2006
Buku Teks
Mills, Criss B., author
Wiley-Academy, 2011
Buku Teks
Shay, Susan T., author
Kiplinger Books, 2001
Buku Teks
O.Toole, James M
Tian Xia Wenhua Chuban, 1996
Buku Teks
Booher, Diana
Prentice-Hall, 1991
Buku Teks