Cronin, James E., author
Routledge, 1991
Buku Teks
Hommon, Robert J., author
Oxford University Press, 2016
Buku Teks
by George M. Thomas [and others]
Sage, 1987
Buku Teks
Longman Cheshire, 1991
Buku Teks
Sarah Ashwin, editor
Routledge, 2000
Buku Teks