Singapore Archipelago Press 1996,
Buku Referensi
edited by Anthony Reid
Archipelago Press, 2001
Buku Teks SO
Horne, Herbert P.
Haskell House , 1970
Buku Teks SO
Blainey, Geoffrey, 1930-
Georgian House, 1958
Buku Teks SO
edited by Allen F. Davis and Harold D. Woodman
D.C. Heath, 1984
Buku Teks SO