FFPRHC Guidance (January 2004). The copper intrauterine device as long-term contraception.
Penney G, Brechin S, de Souza A, Bankowska U, Belfield T, Gormley M, Olliver M, Hampton N, Howlett-Shipley R, Hughes S, et al. J Fam Plann Reprod Health Care. 2004 Jan; 30(1):29-41; quiz 42.