Al-Ghurabi, B. H. . “Impact of Smoking on the IL-1Β, IL-8, IL-10, IL-17 and TNF-α Production in Chronic Periodontitis Patients”. Journal of Asian Scientific Research, vol. 3, no. 5, May 2013, pp. 462-70, https://archive.aessweb.com/index.php/5003/article/view/3504.