APA (7th ed.) Citation

World health organization, United Nations environment programme, & International labour organisation. (1997). Guidelines for poison control. World Health Organization.

Chicago Style (17th ed.) Citation

World health organization, United Nations environment programme, and International labour organisation. Guidelines for Poison Control. Geneva: World Health Organization, 1997.

MLA (9th ed.) Citation

World health organization, et al. Guidelines for Poison Control. World Health Organization, 1997.