Macchiavelli, author
Da Capo Press, 2001
Buku Teks
Myers, Bernard S., author
McGraw-Hill, 1967
Buku Teks
Ministerio das Relacoes Exteriores do Brazil , 1976
Buku Teks
Mcinnes, Graham
Toronto The Macmillan Co of Canada Limited 1950
Buku Teks
Bushell, Stephen W., author
Wyman and Sons, 1906
Buku Teks