Ester Selfia Napitupulu and Helmi Wardah Nasution, “The Relationship Of Adolescent Women’s Knowledge About Maturing The Age Of Marriage On The Risk Of Early Marriage At SMPN 5 Panyabungan Kota Mandailing Natal Regency”, Jurnal EduHealth, vol. 11, no. 2, pp. 123–128, Feb. 2021.