Krisch, Nico, author
Oxford University Press, 2010
Buku Teks
Berman, Paul Schiff, 1966-, author
Cambridge University Press, 2012
Buku Teks
Muñiz-Fraticelli, Victor Manuel, author
Oxford University Press, 2014
Buku Teks
Bowen, John R., author
Cambridge Uiversity Press, 2003
Buku Teks
Glenn, H. Patrick.
Oxford University Press , 2014
Buku Teks