Ribner, Irving
Methuen , 1962
Buku Teks
edited by Russell A. Fraser and Norman Rabkin
Macmillan, 1976
Buku Teks
Salgado, Gamini
Macmillan Education, 1984
Buku Teks
Bradbrook, Muriel Clara, 1909-1993
Cambridge University Press, 1980
Buku Teks
edited by J.M. Morrell
Penguin Books, 1950
Buku Teks