Taylor, Tamara; Keyse, Laura; Bryant, Aimee (2006). Contraception and Sexual Health, 2005/06(PDF). London: Office for National Statistics. ISBN1-85774-638-4. Archivado desde el original el 9 de enero de 2007. British women aged 16–49: 24% currently use the Pill (17% use Combined pill, 5% use Minipill, 2% don't know type)
World Health Organization (1997). «Long-term reversible contraception. Twelve years of experience with the TCu380A and TCu220C». Contraception56 (6): 341-52. PMID 9494767.
Taylor, Tamara; Keyse, Laura; Bryant, Aimee (2006). Contraception and Sexual Health, 2005/06(PDF). London: Office for National Statistics. ISBN1-85774-638-4. Archivado desde el original el 9 de enero de 2007. British women aged 16–49: 24% currently use the Pill (17% use Combined pill, 5% use Minipill, 2% don't know type)