Alley, E. Roberts, author
Mcgraw-Hill, 2000
Buku Referensi
Lawson, Joseph W.R., II, author
American Management Association, 1998
eBooks
editor in chief, Gerard H. "Gus" Gaynor
McGraw-Hill, 1996
Buku Referensi
Armstrong, Michael, author
Kogan Page Limited, 1995
Buku Referensi
Amstrong, Michael, author
Crest Publishing House, 1999
Buku Referensi