Khan, Shaista, Mohammad Ashraf, and Sanaullah Khan Khan. 2020. “Assessment of Drought Occurrences in Zhob District Using Standardized Precipitation Index from 1981-2018”. Journal of Geography and Social Sciences (JGSS) 2 (2):110-21. http://jgssjournal.uob.edu.pk/journal/index.php/jgss/article/view/13.