Yonni Siwi, Retno Palupi, et al. “The Effectiveness of Ginger Oil Aromatherapy and Lemon Oil Aromatherapy on Reducing Emesis Gravidarum in Pregnant Women”. Science Midwifery, vol. 10, no. 5, Dec. 2022, pp. 4109-15, doi:10.35335/midwifery.v10i5.992.