Raine, Kathleen, 1908-2003
The British Council by Longmans, Green, 1965
Buku Teks
Ketton-Cremer, R.W.
Longmans, Green & Co., 1958
Buku Teks
Laski, Marghanita
Thames & Hudson, 1973
Buku Teks
Garrow, H.W.
The Clarendon press, 1939
Buku Teks
Lyall, K.C.B.
Macmillan, 1930
Buku Teks