1. 2. JE Darroch, JJ Frost, and S Singh, 2001 , op. cit. (see reference 1).
2. 3. Ibid. L Berne, and B Huberman and, European approaches to adolescent sexual behavior and responsibility, 1999, http://www.advocatesforyouth.org/publications/european.pdf, accessed Feb. 28, 2003 .
3. Does the Timing of the First Family Planning Visit Still Matter?