Salman, Mohamed Alwan. “Use of Pollen Supplements and Substitutes in Feeding of Honey Bee Colonies, Apis Mellifera L. During Summer Season”. Journal of Kerbala for Agricultural Sciences 1, no. 1 (March 1, 2013): 109–121. Accessed May 14, 2024. http://journals.uokerbala.edu.iq/index.php/Agriculture/article/view/339.