Watkins, Michael, author
Jossey-Bass, 2002
Buku Teks
Goleman, Daniel, author
Harvard Business School Press, 2001
Buku Teks
Harvard Business School Press, 1999
Buku Teks
Keithly, David M., author
Westview Press, 1986
Buku Teks
Montgomery, Robert L., author
Little, Brown, 1962
Buku Teks