edited by Craig Donnellan
Independence Educational Publishers, 1994
Buku Teks
Keel, Pamela K., author
Pearson Prentice-Hall, 2005
Buku Teks
Curtis, Audrey, author
Routledge, 2009
Buku Teks
Pipes, Peggy L.
Tinus Mirror/Mosby , 1989
Buku Teks
Harrington, Richard
New York, 1993
Buku Teks