Botting, Fred, author
Routledge , 1996
Buku Teks
McKenzie, Bertha, author
University of Sydney, 1989
Buku Referensi
Radding, Charles M., author
Yale University Press, 1991
Buku Teks
Cambridge University Press, 2000
Buku Teks
Blackwell Publishers, 2000
Buku Teks