1. Erikson EH. Identity: Youth and Crisis. New York: WW Norton, 1968.
2. Fishbein MJ, Ajzen I. Belief, Attitude, Intention, and Behavior. Reading, MA: Addison-Wes-ley, 1975.
3. Saunders GH. Other evaluation procedures. In: H Tobin (ed.), Practical Hearing Aid Selection and Fitting. Baltimore: Rehabilitation Research and Development Service, 1997.
4. Sprinthall NA, Collins WA. Adolescent Psychology. New York: McGraw-Hill, 1995.
5. Zimbardo PG, Ebbesen EB, Maslach C. Influencing Attitudes and Changing Behavior. Philippines: Addison-Wesley, 1977.