1. APA & POLL, H. (2014), The Stress in America Survey: 2013. Retrieved from http://www.apapracticecentral.org/update/2014/02-13/teen-stress.aspx.
2. BALTAS, Z., ATAKUMAN Y., & DUMAN, Y. (1998, July), Standardization of the perceived stress scale: perceived stress in middle managers. Paper presented at the 19th International Conference, Stress and Anxiety Research Society, Istanbul.
3. BANKS, V. (1999). A solution focused approach to adolescent group work. A.N.Z.J. Family Therapy, 20 (2), 78-82.
4. BECK, T. A. (1963), Thinking and Depression: I. idiosyncratic content and cognitive distortions, Archieves of General Psychiatry, 94 (4). 324-333.
5. BECK, A., WISSMAN, A., LESTER, D., & TREXLER, L. (1974), The measurement of pessimism: The Hopelessness Scale, Journal of Consulting and Clinical Psychology, 42 (6), 861-865.