1. Age at menarche and racial comparisons in US girls;Chumlea;Pediatrics,2003
2. Has age at menarche changed? Results from the national health and nutrition examination survey (NHANES) 1999–2004;McDowell;J Pediatr Adolesc Gynecol,2007
3. Reed B., Carr B.R.The normal menstrual cycle and the control of ovulation. Endotext [Internet]. 2000-2018.
4. Neuroendocrine causes of amenorrhea—an update;Fourman;J Clin Endocrinol Metab,2015
5. Pediatric & Adolescent Gynecology;Emans,2020