1. The Directive of the European Parliament and of the Council on combating the sexual abuse and sexual exploitation of children and child pornography. http://www.eur-lex.europa.eu (accessed 3 November 2022).
2. Rudolph's Pediatrics (Section 5, Chapters 65-70);Rudolph,2003
3. Nelson Textbook of Pediatrics;Kliegman,2007
4. Oski's Pediatrics: Principles and Practice;McMillan,2006
5. Variations in pattern of pubertal changes in girls;Marshall;Arch Dis Child,1969