Saad Ahmed Mohammed Al-Doori, Dr. “A Study of the Importance of Sowing Dates and Plant Density Affecting Some Rapeseed Cultivars (Brassica Napus L.)”. College of Basic Education Research Journal 11, no. 1 (March 1, 2012): 615–632. Accessed October 27, 2025. https://jeh.uomosul.edu.iq/index.php/berj/article/view/38259.