Digumarti Bhaskara Rao, editor
Discovery Publishing House, 2001
Buku Teks
McBeth, Adam, author
Oxford Univ Press, 2011
Buku Teks
edited by A.H. Robertson
Manchester University Press, 1968
Buku Teks
United Nations, 1988
Buku Teks
United Nations, 1988
Buku Teks