McIlroy, John, author
Manchester University Press , 1995
Buku Teks
Richards, Denis, author
Longman, Green, 1952
Buku Teks
The British Council, 1959
Buku Teks
Philip, George, author
George Philip and Son, 1983
Buku Referensi
Morrell, W.P.
Clarendon Press, 1960
Buku Teks