1. Allport G. W., 1961. Pattern and growth in personality Holt, Rinehart & Winston, New York.
2. Anderson J. C., Gerbing D. W., 1988. Structural equation modeling in practice: A review and recommended two-step approach. Psychological Bulletin103:411-423.
3. Arbuckle J. L., 1997. AMOS user's guide version 3.6 SmallWaters Corporation, Chicago.
4. Atchley R., 1988. Social forces and aging 5th ed. Wadsworth, Belmont, CA.
5. Ausubel D. P., 1963. The psychology of meaningful verbal communication Grune & Stratton, New York.