Armstrong, Michael
Kogan Page Limited, 1995
Buku Referensi
editor in chief, Gerard H. "Gus" Gaynor
McGraw-Hill, 1996
Buku Referensi
Amstrong, Michael
Crest Publishing House, 1999
Buku Referensi
Cleland, David I.
McGraw-Hill, 2010
Buku Teks
Shepherd, Elizabeth J., 1960-
London, Facet
Buku Referensi