Mossa M. Marbut, Mena D. Mustafa, and Jawad A. Salih. “Study of Parathyroid Gland Function in Normal Pregnant Women in Tikrit City”. Journal of Madenat Alelem University College, Vol. 9, no. 2, Dec. 2017, pp. 1-14, http://116.203.176.164/index.php/JMAUC/article/view/67.