Sahib, Amjed M, and Nada J Radhi. “Oral Cleanness and Periodontal Health Status Among Coffee-Shop Workers in Najaf City Iraq”. Journal of Baghdad College of Dentistry, vol. 30, no. 4, Dec. 2018, pp. 15-19, https://doi.org/10.26477/jbcd.v30i4.2549.