Losonsky, Michael, author
Cambridge University Press, 2006
Buku Teks
Chomsky, Noam, author
Cambridge University Press, 2002
eBooks
Harvester Wheatsheaf , 1992
Buku Teks
Holloway, John, author
Macmillan, 1951
Buku Teks
Greene, Judith, author
Methuen , 1975
Buku Teks