Saad A. M. Al-Doori, Dr. 2012. “Effect of Leaves Defoliation and Plant Density on Growth, Yield and Quality of Some Sunflower Genotypes (Helianthus Annuus L., Compositae)”. College of Basic Education Research Journal 11 (3):724-51. https://moss.uomosul.edu.iq/index.php/berj/article/view/39266.