Foreign and Commonwealth Office
Her Majesty's Stationery Office, 1986
Buku Referensi
Griffiths, Percival, Sir, 1899-
Ernest Benn, 1969
Buku Teks
Mansergh, Nicholas
Royal Institute Of International Affair, 1948
Buku Teks
Underhill, Frank H.
Duke University Press, 1956
Buku Teks
Mansergh, Nicholas
Royal Institute Of International Affair, 1954
Buku Teks