Theen, Rolf H.W, author
Prentice-Hall, 2001
Buku Teks
Madgwick, P.J., author
Stanley Thornes, 1992
Buku Teks
edited by Maurice Mullard
Routledge, 1995
Buku Teks
Derbyshire, J. Denis, author
McGraw-Hill , 1979
Buku Teks
McIlwain, Charles Howard, author
Russell and Russell, 1965
Buku Teks