edited by William A. Robson
Macmillan, 1955
Buku Teks
Taylor, Griffith
Methuen, 1951
Buku Teks
Taylor, Griffith
Methuen, 1949
Buku Teks
edited by Robert Moore Fisher
Doubleday, 1955
Buku Teks
edited by Andrew Blowers, Chris Hammett and Philip Sarre
Hutchinson Educational in association with the Open University Press, 1974
Buku Teks