by Andrew West [and others]
Fourmat Publishing, 1992
Buku Teks
Weston, Martin
Oxford, 1991
Buku Teks
Weston, Martin
Berg Publishers, 1993
Buku Teks
Fisher, Howard D.
Cavendish Publishing Limited, 1999
Buku Teks
Gooch, R.K. (Robert Kent), 1893-1982
Appleton-Century, 1935
Buku Teks