APA (7th ed.) Citation

Riotton, G., & Christopherson, W. M. (1977). Cytology of non-gynecological sites. World Health Organization.

Chicago Style (17th ed.) Citation

Riotton, G., and W. M. Christopherson. Cytology of Non-gynecological Sites. Geneva: World Health Organization, 1977.

MLA (9th ed.) Citation

Riotton, G., and W. M. Christopherson. Cytology of Non-gynecological Sites. World Health Organization, 1977.