H. W. Nasution, “Relationship Of Parity, Education And Sources Of Information With The Level Of Knowledge Of The Mother About The Provision Of Immunization Basis In Desa Barbaran Jae Kec. Panyabungan Barat Tahun 2019”, Jurnal EduHealth, vol. 10, no. 01, pp. 1–7, Mar. 2022.