W. AL-Hashimi, M., and R. Al-Doori. “A Clinical Comparison Between Maxillary and Mandibular Posterior Teeth Using Local Anesthesia and Normal Saline by the Periodontal Ligament Injection (An in Vivo Study) ”. Journal of Baghdad College of Dentistry, Vol. 24, no. Special Is, 1, pp. 18-23, http://jbcd.uobaghdad.edu.iq/index.php/jbcd/article/view/1200.