Murphy, Tom, author
American Management Association, 2007
eBooks
Marquis, 1899
Buku Referensi
Shetterly, Margot Lee, author
An imprint of HarperCollins , 2016
Buku Teks
Ritter, Scott, author
IB Tauris, 2005
Buku Teks
Dingus, Lowell, author
Carlton, 2012
Buku Referensi