Young, Robert, 1950-, author
John Wiley & Sons, 2015
Buku Teks
Bremner, G. A., author
Oxford University Press, 2016
eBooks
Greenwood Press, 1995
Buku Teks
Williams, Basil, author
Oxford University, 1945
Buku Klasik
Sankar Muthu
Cambridge University Press, 2014
Buku Teks