Redmond, Peter W.D.
Macdonald and Evans, 1965
Buku Teks
Perry, F. E.
Cox & Wyman Ltd, 1972
Buku Teks
McLoughlin, J.
Manchester University Press, 1972
Buku Teks
Poh, Chu Chai
LexisNexis, 2011
Buku Teks
Chorley, Lord
Sir Isaac Pitman & Sons, 1960
Buku Teks