Senelle, Robert
Ministry of Foreign affairs, external trade and co, 1972
Buku Teks
Senelle, Robert
Ministry of Foreign Affairs and External Trade , 1979
Buku Teks
Godfrey, M.G., author
Edward Arnold , 1986
Buku Teks
Presley, John W., author
Prentice-Hall, 1982
Buku Teks
Hicks, John R., author
Clarendon Press, 1959
Buku Teks