Yaseen, A. A., and N. S. A. Al-Mousawy. “Response of Tow Varieties of Okra (Abelmoschus Esculentus L. Moench) to Application Methods of Humic Acid, Zolfast and Their Effects on Vegetative Growth Charectristics and Yield”. Al-Qadisiyah Journal of Pure Science, Vol. 19, no. 3, July 2017, pp. 54-75, https://journalsc.qu.edu.iq/index.php/JOPS/article/view/162.