5Anderson,Dianna L.& Merrill C.Anderson (2005).Coaching that counts:Harnessing the power of leadership coaching to deliver strategic value.New York:Elsevier Butterworth Heinemann.
6Edwards,A.L.(1957).The social desirability variable in personality research.New York:Dryden.
7Hurd,Jennifer M.(2002).Moving beyond social desirability:A practical method for measuring faking in applied settings.The University Of Akron,PhD Dissertation.
8Riso,Don Richard (1987).Personality types:using the enneagram for self-discovery.Boston:Houghton Mifflin Company.
9Riso,Don Richard,& Hudson,Russ (1999).The wisdom of the enneagram:The complete guide to psychological and spiritual growth for the nine personality.USA:Bantam Books.
10Riso,Don Richard,& Hudson,Russ (2000).Understanding the enneagram:The practical guide to personality types (revised edition).Boston,New York:Houghton Mifflin Company.