Moelyo, A., A. Wulandari, O. Imas, U. Rahma, N. Hidayah, C. Kesumaningtyas, F. Nur, and H. Nugroho. “Age at Menarche and Early Menarche Among Healthy Adolescents”. Paediatrica Indonesiana, Vol. 59, no. 1, Feb. 2019, https://paediatricaindonesiana.org/index.php/paediatrica-indonesiana/article/view/2038.