Afiliany, Amelia, Ahmad Suryawan, and Rize Budi Amalia. 2025. “The Relationship Between Age and Level of Knowledge About Menstruation and Readiness for Menarche in Grade IV - VI Female Students at Kertajaya Elementary School ”. PROFESSIONAL HEALTH JOURNAL 7 (1):261-69. https://doi.org/10.54832/phj.v7i1.1068.