Endicott, Timothy, author
Oxford University Press, 2015
Buku Teks
Foulkes, David, 1924-, author
Butterworth, 1990
Buku Teks
Stone, Geoffrey R.
Little, Brown and Company, 1991
Buku Teks
Wade, E. C. S. (Emlyn Capel Stewart), author
Longmans Green, 1951
Buku Teks
Wade, E. C. S. (Emlyn Capel Stewart), author
[publisher not identified], [date of publication not identified]
Buku Teks