1. 1. Tanner J. M. Growth and Endocrinology of the Adolescent. L.I. Gardner ed. In Endocrine and Genetic Disorders of Childhood. Philadelphia and London: W. B. Saunders Co. 1969 19.
2. 2. Greulich W.W. and PyIe S.I. Radiographic Atlas of Skeletal Development of the Hand and Wrist. Second Edition. Stanford: Stanford University Press. 1959.
3. 3. Tanner J. M. Whltehouse R. H. and Healy M. J. R. A New System for Estimating Skeletal Maturity from the Hand and Wrist with Standards Derived from a Study of 2600 Healthy British Children. Paris: Centre International de l'enfance 1962.
4. 4. Kelch R. P. Kaplan S. L.. and Grumbach M. M. Suppression of plasma and urinary gonadotropins by exogenous estrogens in prepubertal and pubertal children. American Pediatric Society Washington. May 1972. Abstract In Ped. Res. 6 (1972) 354.
5. 5. Werff ten Bosch J.J. van der. Control of Puberty by Endocrine and Other Factors. Proceedings Second International Congress Endocrinology (London) Part 2. 833. Internat. Congr. Ser. N. 83. Amsterdam and New York: Excerpta Medica Foundation 1965.