Leal, A. R.
Longman, 1979
Buku Teks
Black, Geoff
London : Prentice Hall, 2001,
Buku Referensi
Association for investment Management Research, 1996
Buku Teks
Stevens, P.
Macmillan, 1990
Buku Teks
Yorston, Robert Keith, Sir.
Law Book Company, 1966
Buku Teks