Fisher, Roger, author
Panguin Books, 1991
Buku Teks
Fisher, Roger, author
Business Books, 2011
Buku Teks
Blackman, Carolyn
Allen & Unwin, 1997
Buku Teks
Hoffstaedter, Gerhard, author
Nias Press, 2011
Buku Teks
Susskind, Lawrence E., author
Oxford University Press, 2015
Buku Teks