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
Turnbull, C. M. (Constance Mary)
Oxford University Press, 1985
Buku Teks
Crisp, Dorothy
Dorothy Crisp, {s.a}
Buku Teks