Radhi, Nada J. “Gingival Health in Relation to Salivary Vitamin C and Total Protein Among Dental Students ”. Journal of Baghdad College of Dentistry, vol. 26, no. 3, Sept. 2014, pp. 156-9, https://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/534.