Danish, Zeeshan, et al. “FREQUENCY OF GINGIVAL RECESSION AND ITS SEVERITY: A CROSS SECTIONAL STUDY AMONG PATIENTS VISITING PERIODONTICS DEPARTMENT, KHYBER COLLEGE OF DENTISTRY, PESHAWAR”. Pakistan Oral & Dental Journal, vol. 39, no. 1, Apr. 2019, pp. 60-64, https://podj.com.pk/index.php/podj/article/view/349.