1. Contraception and Sexual Health 2006/07 (Omnibus Survey Report No. 33);[19 September 2008].
2. Clinical Excellence (NICE). Long-Acting Reversible Contraception (Clinical Guidance CG30);[19 September 2008].,2005
3. Depo-Provera® 150 mg/ml Injection: Summary of Product Characteristics;[19 September 2008].
4. Faculty of Sexual and Reproductive Healthcare (FSRH). UK Selected Practice Recommendations for Contraceptive Use;[19 September 2008].,2002
5. Estimates of contraceptive failure from the 2002;Kost, K.; Singh, S.; Vaughan, B.; Trussell, J.; Bankole, A.;National Survey of Family Growth. Contraception,2008