Ainscow, M. Beresford J. Harris, A., Hopkins, D., Southworth, G. and West, M. (2000) Creating the Conditions for School Improvement, Second Edition, London: David Fulton Publishers.
Annastasi Anne (1961), “Psychological Testing”, 2nd Ed. New York, The Mac Millan Company.
Burnham, W.H. (1932), “The Wholesome Personality”, D. Appleton Century Co. Inc., New York, 9.73.