A. M. Al-Doori, Saad, and Moaid Y. H. Al-Dulaimy. “Influence of Zinc Fertilization Levels on Growth, Yield and Quality of Some Sunflower Genotypes (Helianthus Annuus L.)”. College of Basic Education Research Journal 11, no. 4 (December 1, 2012): 741–730. Accessed October 26, 2025. https://stats.uomosul.edu.iq/index.php/berj/article/view/39127.