edited by A.H. Robertson
Manchester University Press, 1968
Buku Teks
Smith, Rhona K., author
Routledge, 2010
Buku Teks
edited by Jeffrey F. Addicott, Md. Jahid Hossain Bhuiyan, Tareq M.R. Chowdhur
Oxford University press, 2012
Buku Teks
United Nations, 1988
Buku Teks
Carey, John, author
Oceana Publications, Inc, 1968
Buku Teks