Johansen, Bob, author
Berrett-Koehler, 2012
Buku Teks
Cadwell, Charles M., author
[American Management Association, ], 2004
eBooks
Kouzes, James M., author
Jossey-bass, 2012
Buku Teks
Ciampa, Dan
Harvard Business School Press, 1999
Buku Teks
Underhill, Brian O., author
Berrett-Koehler Publishers, Inc., 2007
Buku Teks