Slyper, A.H. (2006). «The pubertal timing controversy in the USA, and a review of possible causative factors for the advance in timing of onset of puberty». Clinical Endocrinology. 65: 1–8. ISSN0300-0664. doi:10.1111/j.1365-2265.2006.02539.x.
Slyper, A.H. (2006). «The pubertal timing controversy in the USA, and a review of possible causative factors for the advance in timing of onset of puberty». Clinical Endocrinology. 65: 1–8. ISSN0300-0664. doi:10.1111/j.1365-2265.2006.02539.x.