Darr, Kurt, author
The John Hopkins University Press , 1997
Buku Teks
Garrett, Thomas M., author
Prentice-Hall, 2001
Buku Teks
edited by Michael Parker
Routledge , 1999
Buku Teks
Furrow, Barry R, author
Thomson/West, 2008
Buku Teks
Smith, George P., author
Taylor and Francis, 1996
Buku Teks