Reference Service Division. National Library Singapore, 1984
Buku Referensi
Saw Swee Hock
ISEAS (Institute of Southeast Asian Studies), 2007
Buku Teks
edited by Helen Hughes and You Poh Seng
University of Wisconsin Press, 1969
Buku Teks
Price Waterhouse, 1966
Buku Teks
Soe, Myint
Unstitute of Banking and Finance, 1978
Buku Teks