Schulman, Neil
Fawcett Gold Medal, 1979
Buku Teks
Tasker, Yvonne, 1964-, author
Wiley Balckwell, 2015
Buku Teks
Schats, Thomas, author
Simon & Schuster Macmilan, 1997
Buku Referensi
Mckee, Robert, author
Methuen, 1999
Buku Teks
Gironiere, Paul P. de la
A Burke-Mailhe Publication, 1972
Buku Teks