Bastin, John
The Clarendon Press , 1957
Buku Teks
Bradbrook, Muriel Clara, 1909-1993
Longmans, 1958
Koleksi Publik
Barley, Nigel
Penguin books , 2002
Buku Teks
Ketton-Cremer, R.W.
Longmans, Green & Co., 1958
Buku Teks
Alssid, Michael William, 1927-
Twayne, 1967
Buku Teks