Manurung, H. R., H. Santoso, K. Rochadi, and J. Juanita. “Intervention Effects in Using an Application Compared With a Module With Pictures on Knowledge, Attitude, and Practice of the Pregnant Women in North Sumatra, Indonesia”. Open Access Macedonian Journal of Medical Sciences, vol. 10, no. E, Jan. 2022, pp. 121-5, doi:10.3889/oamjms.2022.8125.