Al-Fatlawi, Suhaila Mohsen Kazem. “The Factors Contributing to Wastage of Instructional Time As Perceived by Principals of Popular Schools in Derna ”. Al-Mukhtar Journal of Social Sciences, vol. 13, no. 1, Dec. 2012, pp. 85-107, https://doi.org/10.54172/qv64dw34.