Russell, Sir E. John
George Allen and Unwin, 1961
Buku Teks
Hammond, Winifred
Coward-McCann, 1961
Buku Teks
Barnett, Arthur Doak
Overseas Development Council, 1979
Buku Teks
Alberto Garrido, Helen Ingram, editor
Routledge,, 2011
Buku Teks
World Food Programme , 1993
Buku Teks