Beilby, Richard
Angus & Robertson, 1975
Buku Teks
Ad. J.J.M. Vingerhoets, Randolph R. Cornelius
Brunner-Routledge, 2001
Buku Teks
Wallace-Crabbe, Chris, 1934-, author
Oxford University Press, 1990
Buku Teks
Kluger, Richard
Vintage Books , 1977
Buku Teks
Brown, Richard E.
John Wiley & Sons, 1982
Buku Teks