APA citiranje

de Villiers, E. M. (1989). Heterogeneity of the human papillomavirus group.

Citação norma Chicago

de Villiers, E M. Heterogeneity of the Human Papillomavirus Group. 1989.

MLA citiranje

de Villiers, E M. Heterogeneity of the Human Papillomavirus Group. 1989.