Couper, J. M
Melbourne University Press , [1969]
Buku Teks
Dening, Greg
Cambridge University Press , 1992
Buku Teks
Kennedy, Gavin
Duckworth, 1989
Buku Teks
Burrow, J.A., author
BlackWell Publishing, 2004
Buku Teks
Couper, A. D.
Hutchinson University Library, 1972
Buku Teks