Ministerio das Relacoes Exteriores do Brazil , 1976
Buku Teks
1964
Buku Teks
Freeland, Cynthia A., author
Oxford University Press, 2001
Buku Teks
Myers, Bernard S., author
McGraw-Hill, 1967
Buku Teks
Edwards, David, author
Sage Publication, 2004, 2004
Buku Teks