Dharmarha, N., and A. Konda. “A Study of the Factors Affecting the Receding Age of Onset of Menarche in Young Girls”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 7, no. 7, June 2018, pp. 2813-9, doi:10.18203/2320-1770.ijrcog20182887.