Watt, William Montgomery
Oxford University Press, 1961
Buku Teks SO
Geyl, Pieter, 1887-1966
The World Publishing, 1971
Buku Teks SO
National Archives of Singapore, National Heritage Board, 1998
Buku Referensi
Tarling, Nicholas
New Zealand Asia Institute , 2000
Buku Teks SO
Shteppa, Konstantin F.
Rutgers University Press, 1962
Buku Teks SO