Longmore, George, author
Golden Dog Press, 1977
Buku Teks
Natov, Roni, author
Routledge, 2006
Buku Teks
Leon Van Schaik, editor
Wiley Academy, 2002
Buku Teks
Elkins, James, author
Cornell University Press, 1994
Buku Teks
Mcinnes, Graham
Toronto The Macmillan Co of Canada Limited 1950
Buku Teks