Daulay, Maswan. “Description of Knowledge Level of Nurses about Care of Covid-19 Patients in Tuan Rondahaim Hospital, Pamatang Raya Simalungun Regency”. Science Midwifery, vol. 10, no. 2, Mar. 2022, pp. 743-7, https://www.midwifery.iocspublisher.org/index.php/midwifery/article/view/355.