3Abbas, M., & Raja, U. (2015) . Impact of psychological capital on innovative performance and job stress. Canadian Journal of Ad- ministrative Sciences, 32 (2) , 128-138.
4Badran, M. A., & Youssef-Morgan, C. M. (2015) . Psychological capital and job satisfaction in Egypt. Journal of Managerial Psychology, 30, 354-370.
5Floyd, S. W., & Wooldlidge, W. (1994) . Dinosaurs or dynamos?Recognizing middle management's strategic role. Academy of Management Executive, 8 (4) , 47-57.
6Lodahl, T.M., & Kejner, M. (1965) .The definition and measurement of job involvement. ,lournal of Applied Psychology, 49, 24-33.
7Lu, L. (1999) . Personal or environmental causes of happiness: A longitudinal analysis. Journal of" Social Psychology, 139, 79-90.
8Luthans, F., Avolio, B. J., Walumbwa, F. O., & Li, W. (2005) The psychological capital of Chinese workers: Exploring the re- lationship with performance. Management curd Organization Re- view, 1 (2) , 249-271.
9Luthans, F., & Youssef, C. M. (2004) . Human, social and now posi- tive psychological capital management: Investing in people for competitive advantage. Organizational Dynamics, 33, 143-160.
10Mathieu. J. E., & Zajac, I). M. (1990) .A review and meta-anMysis of the antecedents, correlates, and consequences of organiza- tional commitment. Psychological Bulletin, 108, 171-194.
