Jones, Malcolm V.
Cambridge University Press, 1990
Buku Teks SO
Sheehan, Paul
Cambridge University Press, 2010
eBooks
edited by Matthew Beaumont
Blackwell, 2007
Buku Teks SO
Shahid Rahman
Springer, 2012
eBooks
Bhattacharji, Sukumari
K.P. Bagchi,, 1984
Buku Teks SO