by Donald L. Plucknett ... [et al.]
Princeton University Press, 1987
Buku Teks
Russell, Sir E. John
George Allen and Unwin, 1961
Buku Teks
Hammond, Winifred, author
Coward-McCann, 1961
Buku Teks
Barnett, A. Doak (Arthur Doak), author
Overseas Development Council, 1979
Buku Teks
Alberto Garrido, Helen Ingram, editor
Routledge,, 2011
Buku Teks