Hutson, Lorna, author
Routledge, 1997
Buku Teks
Ramsey, Peter H.
Metheun & Co. Ltd., 1971
Buku Teks
Cheney, Patrick, author
Wiley, 2011
Buku Teks
Edited, Suzanne Ferriss, Mallory Young
Routledge, 2006
Buku Teks
Allen, J. W., author
Methuen, 1951
Buku Teks