Bzhalava, D; Guan, P; Franceschi, S; Dillner, J; Clifford, G (2013), "A systematic review of the prevalence of mucosal and cutaneous human papillomavirus types", Virology, 445 (1–2): 224–31, [1]
Condom use in prevention of Human Papillomavirus infections and cervical neoplasia: systematic review of longitudinal studies.
Lam JU1, Rebolj M, Dugué PA, Bonde J, von Euler-Chelpin M, Lynge E. [3]
"CDC — Condom Effectiveness — Male Latex Condoms and Sexually Transmitted Diseases". Centers for Disease Control and Prevention (CDC). 22 October 2009. Archived from the original on 17 October 2009. Retrieved 23 October 2009. [4]