Hughes, John P.
Random House, 1962
Buku Teks
Overy, R.J.
Oxford University Press , 1994
Buku Teks
Thurlow, Richard, author
Cambridge University Press, 1999
Buku Teks
Painter, Clare
OXford University Press, 1989
Buku Teks
Taylor, Telford
Quadrangle, 1952
Buku Teks