Smith, Gina, author
[American Management Association, ], 2005
eBooks
Fielding, Joy, author
Gramedia Pustaka Utama, 2005
Buku Teks
Alleyne, Brian, author
Sage, 2015
Buku Teks
Thornburg, Ryan, author
CQ Press, 2011
Buku Teks
Waller, Robert James, author
Warner Books, 1992
Buku Teks