علي صالح أ. sources of Job Stress According to the point of view of secondary and preparatory school Headmasters in Nineveh governorate center. BERJ [Internet]. 2010 Mar. 1 [cited 2025 Oct. 26];9(1):1-20. Available from: https://stats.uomosul.edu.iq/index.php/berj/article/view/38766