Watt, William Montgomery
Oxford University Press, 1961
Buku Teks
Geyl, Pieter, 1887-1966
The World Publishing, 1971
Buku Teks
National Archives of Singapore, National Heritage Board, 1998
Buku Referensi
Tarling, Nicholas
New Zealand Asia Institute , 2000
Buku Teks
Floud, Roderick
Princeton University Press, 1973
Buku Teks