Goodrich, Peter
Macmillan, 1987
Buku Teks
Lacour, Claudia Brodsky
Duke University Press, 1996
Buku Teks
Day, Ronald E.
Southern Illinois University Press, 2001
Buku Teks
Rigby, Brian
Routledge , 1991
Buku Teks
Redden, Kenneth R.
The Michie Company, 1980
Buku Referensi