Betz, Frederick
Emerald, 2016
eBooks
Randall S.Schuler, Susan E.Jackson, editor
Blackwell Publisher, 2000
Buku Teks
Mike Millmore, Philip Lewis, Mark Saunders, Adrian Thornhill, Trevor Morrow
Prentice-Hall, 2007
Buku Teks
Fombrun, Charles
John Wiley & Sons, 1984
Buku Teks
Nankervis, Alan R.
Thomas Nelson Australia, 1996
Buku Teks