“Relationships Between Body Mass Index, Psychological Stress, Physical Activity, and Oligomenorrhea in Adolescents at Yasinat Islamic Boarding School, Surabaya”. Journal of Maternal and Child Health 7, no. 6 (November 16, 2022): 742–749. Accessed November 3, 2025. https://thejmch.com/index.php/thejmch/article/view/865.