Selk, Jason
Executive toughness : the mental-training program to increase your leadership performance
McGraw-Hill, 2012
 Buku Teks
Bellows, Roger
Executive skills : their dynamics, and development
Prentice-Hall, 1962
 Buku Teks SO
Underhill, Brian O.
Executive coaching for results : the definitive guide to developing organizational leaders
Berrett-Koehler Publishers, Inc., 2007
 Buku Teks SO
Vance, Charles C.
Manager today, executive tomorrow
McGraw-Hill, 1974
 Buku Teks
Heyel, Carl
Appraising executive performance / Carl Heyel
American Management Association, 1958
 Buku Teks