↑"For girls, puberty begins around 10 or 11 years of age and ends around age 16. Boys enter puberty later than girls-usually around 12 years of age-and it lasts until around age 16 or 17." "Teenage Growth & Development: 11 to 14 Years". pamf.org. 2013-07-03 tarixində arxivləşdirilib. İstifadə tarixi: 2016-07-19.
