APA

Clifford G. M., Gallus S., Herrero R., Muñoz N. & Snijders P. J. F.Worldwide distribution of human papillomavirus types in cytologically normal women in the International Agency for Research on Cancer HPV prevalence surveys. : .

Chicago

Clifford G M, Gallus S, Herrero R, Muñoz N and Snijders P J F.Worldwide distribution of human papillomavirus types in cytologically normal women in the International Agency for Research on Cancer HPV prevalence surveys. : .

Harvard

Clifford G. M., Gallus S., Herrero R., Muñoz N. and Snijders P. J. F.Worldwide distribution of human papillomavirus types in cytologically normal women in the International Agency for Research on Cancer HPV prevalence surveys. : .

MLA

Clifford G M, Gallus S, Herrero R, Muñoz N and Snijders P J F.: . .