Pornananrat และ Navaporn. (2016) Effect of smoking on non-surgical periodontal treatment. <i>Journal of The Dental Association of Thailand</i>, <i>66</i>(4), 285-296.Pornananrat และ Navaporn. "Effect of smoking on non-surgical periodontal treatment". Journal of The Dental Association of Thailand 66 (2016):285-296.Pornananrat และ Navaporn. Effect of smoking on non-surgical periodontal treatment. The Dental Association of Thailand:ม.ป.ท. 2016.