Crawford, James
Oxford University press, 2006
Buku Teks
Sornarajah, M.
Cambridge University Press, 2017
Buku Teks
Schill, Stephan W.
Cambridge University press, 2009
Buku Teks
Schil, Stephen W.
Cambridge University Press, 2013
Buku Teks
Sornarajah, M.
Cambridge University Press, 2012
Buku Teks