2M.I. SaitoU. Sex education in School: preventing unwanted pregnancy in adolescents. International Journal of Gynecology & Obstetrics 63 Suppl. 1,1998 : 157 - 160.
3Johanne Sundby, Joar Svanemyr, Tale Mehre. Avoiding unwanted pregnancy - the role of communication, information and knowledge in the use of contraception among young Norwegian women. Patient Education and Counseling, 1999, 38:11 - 19.
4D. Keith Edmonds. Pediatric and Adolescent Gynecology - The UK Experience. J Pediatr Adolese Gynecol, 2002, 15 : 265 -270.
5Chris Magnusson. Adolescent Girls ' Sexual Attitudes and Opposite -Sex Relations in 1970 and in 1996. JOURNAL OF ADOLESCENT HEALTH,2001, 28:242-252.