Cooper, Geoffrey
Butterworth, 1971
Buku Teks
by Robert Chia, Marzuki Usman, Suyanto Gondokusumo and Wong Kwei Cheong
Prentice-Hall, 1992
Buku Teks SO
editor, Timbrell, Martin C.
Stock Exchange, 1994
Buku Referensi
Newall, Christopher
Phaidon, c1987
Buku Teks SO
edited by E.K. Brown
Thomas Nelson and Sons, 1942
Buku Teks SO