Raz, Joseph, author
Oxford Univesity Press, 2009
Buku Teks
Perry, Michael J., author
Oxford University Press , 1990
Buku Teks
Skubik, Daniel W.
Peter Lang , 1990
Buku Teks
Cambridge University Press, 2015
eBooks
Anderson, Owen J., author
Cambridge University Press, 2012
Buku Teks