Baldwin , A. “Analysis of the Chemical Components of the Essential Oil Fraction of Betel Leaf (piper Bettle linn.) and the Antibacterial Activity Test Against Several Types of Gram-Positive Bacteria”. International Journal of Nursing and Midwifery Research, vol. 1, no. 1, Nov. 2022, pp. 9-18, https://journals.iarn.or.id/index.php/ners/article/view/30.