N. L. Ayu, Otniel Ketaren, and Evawani Martalena Silitonga, “The Phenomenon of Refusing Covid-19 Booster Vaccination in Muara Sentosa Subdistrict, Sei Tualang Raso District Tanjungbalai City In 2022 ”, midwifery, vol. 10, no. 4, pp. 3082–3090, Oct. 2022.