Whitworth, Michael H., author
Wiley-Blackwell, 2010
Buku Teks
edited by Antony Easthope, John O. Thompson
Harvester Wheatsheaf, 1991
Buku Teks
Lennard, John, author
University Press, 2005
Buku Referensi
Spacks, Patricia Meyer, author
Wiley-Blackwell, 2009
Buku Teks
Ross, Alan, author
British Council, 1951
Buku Teks