Dr. Musharaf Khan. “Altitudinal and Seasonal Effect on Herbaceous Biomass in Tehsil Takht-E-Nasrati, District Karak, Pakistan”. Global Journal of Science Frontier Research, vol. 12, no. C7, July 2012, pp. 41-52, https://journalofscience.org/index.php/GJSFR/article/view/476.