Buchanan, Robert Angus, author
Penguin, 1972
Buku Teks
McIlroy, John, author
Manchester University Press , 1995
Buku Teks
Morrell, W.P.
Clarendon Press, 1960
Buku Teks
Summerson, John
Penguin Books, 1958
Buku Teks
Watson, W.C.R., author
At The University Press, 2013
Buku Teks