Sullivan, Patricia Noble, author
Macmillan Company, 1997
Buku Teks
Stebben, Gregg, author
Pocket Books, 1999
Buku Referensi
Rosenthal, M. Sara, author
Contemporary Books, 2001
Buku Teks
Young, Bruce K., author
Bantam Dell, 2008
Buku Teks
McKnight-Trontz, Jennifer, author
Torrent Books, 2004
Buku Teks