Mauk, David, author
Routledge, 1997
Buku Teks
Keefe, William J., author
Prentice-Hall, 1994
Buku Teks
OConnor, Karen, author
Addison Wesley Longman, 2001
Buku Teks
Rossiter, Clinton, 1917-1970, author
The American Library, 1960
Buku Teks
Welch, Susan, author
Thomson, 2006
Buku Teks