Lawarti, R., and S. Cahyaningrum. “Potential Antibacterial Activity of Hydroxyapatite Composite And Green Betel Leaf Extract (Piper Betle L.) Against Streptococcus Mutans Bacteria”. Indonesian Journal of Chemical Science, Vol. 11, no. 1, May 2022, pp. 41-49, doi:10.15294/ijcs.v11i1.51059.