Acuff, Frank L., author
American Management Association, 2008
eBooks
Cohen, Herb, author
Serambi Ilmu Semesta, 2011
Buku Teks
Hubbard, Douglas W., author
Wiley, 2014
Buku Teks
Hubbard, Douglas W., author
John Wiley & Sons, 2007
Buku Teks
Hartley, Gregory, author
American Management Association, 2008
eBooks