Simbolon, Pomarida, and Nagoklan Simbolon. “Relationship of Online Learning Methods With Time Management of During The WFH Due to Covid 19 Pandemic in North Sumatera”. Science Midwifery, vol. 9, no. 1, Oktober, Oct. 2020, pp. 44-48, https://midwifery.iocspublisher.org/index.php/midwifery/article/view/36.