C.S. Lim
The Department of English University of Malaya, [date of publication no identified]
Buku Teks SO
edited, James Vinson
ST. James Press, 1985
Buku Teks SO
Elton, Lord
Collins, 1945
Buku Teks SO
Mansergh, Nicholas
Royal Institute Of International Affair, 1948
Buku Teks SO
Griffiths, Percival, Sir, 1899-
Ernest Benn, 1969
Buku Teks