Roper, Kathy O., author
American Management Association, 2014
Buku Teks
Armstrong, Michael, author
Kogan Page Limited, 1995
Buku Referensi
editor in chief, Gerard H. "Gus" Gaynor
McGraw-Hill, 1996
Buku Referensi
Amstrong, Michael, author
Crest Publishing House, 1999
Buku Referensi
Cleland, David I., author
McGraw-Hill, 2010
Buku Teks