Cambridge University Press, 2001
eBooks
Bauer, Laurie
Combridge University Press, 1983
Buku Teks
Bauer, Lauria
London : Routledge, 1998
Buku Teks
Morgan, John, 1944-2004
Oxford University Press, 1990
Buku Teks
Clancy, Laurie, 1942-
University of Queensland, 1989
Buku Teks