Watson, W.C.R., author
At The University Press, 2013
Buku Teks
Philip, George, author
George Philip and Son, 1983
Buku Referensi
Beer, Samuel H.
Clarendon Press, 1957
Buku Teks
Brittain, Herbert, Sir
George Allen and Unwin, 1959
Buku Teks
: B. T. Batsford, 1935
Buku Teks