Sonnex, C., Scholefield, J. H., Kocjan, G., Kelly, G., Whatrup, C., Mindel, A., & Northover, J. M. (1991). Anal human papillomavirus infection: A comparative study of cytology, colposcopy and DNA hybridisation as methods of detection.

Sonnex, C., J H. Scholefield, G. Kocjan, G. Kelly, C. Whatrup, A. Mindel, och J M. Northover. Anal Human Papillomavirus Infection: A Comparative Study of Cytology, Colposcopy and DNA Hybridisation As Methods of Detection. 1991.

Sonnex, C., et al. Anal Human Papillomavirus Infection: A Comparative Study of Cytology, Colposcopy and DNA Hybridisation As Methods of Detection. 1991.