Morrell, W.P.
Clarendon Press, 1960
Buku Teks
Central of Information, 1973
Buku Teks
Summerson, John
Penguin Books, 1958
Buku Teks
Watson, W.C.R., author
At The University Press, 2013
Buku Teks
Philip, George, author
George Philip and Son, 1983
Buku Referensi