Mayer, Robert R.
Prentince-Hall, 1980
Buku Teks
Stein, Theodore J.
Columbia University Press, 2001
Buku Teks
edited by Peter Dwyer, Sandra M I Shaw
Sage, 2013
Buku Teks
Cambridge University Press, 2018
Majalah, Jurnal, Buletin
edited and introduced by Andrew Shonfield and Stella Shaw
Heinemann Educational Books, 1972
Buku Teks