19-Adler, N., Stewart, J., ( 2004), Self-Esteem, in collaboration with the Psychosocial Working Group, Retrieved December 12, 2009. from: http://www.macses.ucsf.edu/research/psychosocial/notebook/selfesteem.html
20-Coopersmith, S. (1981). The antecedents of self-esteem. Palo Alto, CA: Consulting Psychologists Press. (Original work published 1967).
21-Coopersmith, S., & Feldman, R. (1974). Fostering a positive self-concept and high self-esteem in the classroom. In R. H. Coop & K. White (Eds.), Psychological concepts in the classroom (pp. 192-225). New York: Harper and Row.
22-Harter, S. (1999). The construction of the self: A developmental perspective. New York: Guilford Press.
23-Ibrahim, A. S. (2008). Reasonable Thinking: A guide for cognitive therapist to promote positive reasonable thinking. Cairo, Dar Al Kutub.
24-Kimball, O. M. (1973). Development of norms for the Coopersmith Self-Esteem Inventory: Grades four through eight. Dissertation Abstracts International, 34(3-A), 1131-1132.
26-Manning, M. A., Bear, G. G., & Minke, K. M. (2006). Self-concept and self-esteem. In G. G. Bear & K. M. Minke (Eds.), Children’s needs III: Development, prevention, and intervention (pp. 341– 356). Washington, DC: National Association of School Psychologists.
27-Purkey, W. (1988). An overview of self-concept theory for counselors. Retrieved on 24 September, 2019 from http://www.eric.ed.gov
28-Rogers, C.R. (1959). A theory of therapy, personality and interpersonal relationships, as developed in the client-centered framework. In S. Koch (ed.). Psychology: A study of science. (pp. 184-256). N.Y.: McGraw Hill.
29-Rosenberg, M. (1965). Society and the adolescent self-image. Princeton, New Jersey: Princeton University Press.
30-Young, P.(2018). "How the Power of Positive Thinking Can Pay Off in Your Career"، Retrieved 25-4-2019 www.lifehack.org