Utama, Try Genta, and Defrin Defrin. “Prevalence of Pregnant Women With Reactive HBsAg in Padang City in 2019”. Andalas Obstetrics And Gynecology Journal, vol. 6, no. 1, Feb. 2022, pp. 21-26, doi:10.25077/aoj.6.1.21-26.2022.