Weston, Martin
Berg Publishers, 1993
Buku Teks
by Andrew West [and others]
Fourmat Publishing, 1992
Buku Teks
Kahn-Freund, Otto, 1900-1979, author
Clarendon Press, 1991
Buku Teks
Dickson, Brice
Pitman, 1994
Buku Teks
Brown, L. Neville (Lionel Neville), author
Clarendon Press, 1998
Buku Teks