Modaihsh, A.S., A.E. Abdallah, and A.S. Mashhady. 2000. “Micronutrients As Impurities of Inorganic Fertilizers Marketed in Saudi Arabia”. Journal of Agricultural and Marine Sciences [JAMS] 5 (2):91-95. https://journals.squ.edu.om/index.php/jams/article/view/575.