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
Beasley, W.G.
Stanford University Press, 1972
Buku Teks SO
Tarling, Nicholas
New Zealand Asia Institute , 2000
Buku Teks