1. Canadian contraceptive consensus. SOGC Clinical Practice Guidelines, No. 143 [published in 3 parts], February, March, April 2004;Black;J Obstet Gynaecol Can,2004
2. Differences in teenage pregnancy rates among five developed countries: the roles of sexual activity and contraceptive use;Darroch;Fam Planning Perspect,2001
3. High-risk STD/HIV behavior among college students;MacDonald;JAMA,2009
4. Canadian STD guidelines,1998
5. Clinical gynecologic endocrinology and infertility;Speroff,1999