Herod, Andrew, author
Willey Black well, 2009
Buku Teks
Bhagwati, Jagdish, author
Oxford University Press, 2004
Buku Teks
edited by Aseem Prakash and Jeffrey A. Hart
Routledge, 1999
Buku Teks
Mandle, Jay R., author
Cambridge, 2003
Buku Teks
edited by Katja Franko Aas
Sage Published, 2013
Buku Teks