E. Aginta Sembiring, Y. Aldi, and S. Susi, “DAYA HAMBAT JUS APEL MANALAGI (MALUS SYLVESTRIS) TERHADAP PERTUMBUHAN BAKTERI PORPHYROMONAS GINGIVALIS SECARA IN-VITRO”, ADJ, vol. 6, no. 2, pp. 87-92, Oct. 2018.