Henderson, Roger C., author
Michie Law , 1996
Buku Teks
Hodgin, Ray
Cavendish Publishing , 2002
Buku Teks
Soe, Myint, author
Singapore Insurance Training Centre, 1977
Buku Teks
Bruce D. Mudget [and others]
Alexander Hamilton Institute, 1962
Buku Teks
Mowbray, Albert H.
McGraw-Hill, 1955
Buku Teks