Eslami, Maryam, Hamid Dehghanzadeh, M. Jafarzade, and R. Aminian. 2014. “The Effect of Zinc on Yield and Yield Components of Sunflower (Helianthus.Annuus L. )under Drought Stress”. Scientific Journal of Crop Science 3 (6):61-65. http://sjournals.com/index.php/sjcs/article/view/1203.