Cita APA (7th ed.)

Williams, T., Moon, A., & Williams, M. (1990). Food, environment and health: A guide for primary school teachers. World Health Organization.

Cita Chicago (17th ed.)

Williams, Trefor, Alysuon Moon, i Margaret Williams. Food, Environment and Health: A Guide for Primary School Teachers. Geneva: World Health Organization, 1990.

Cita MLA (9th ed.)

Williams, Trefor, et al. Food, Environment and Health: A Guide for Primary School Teachers. World Health Organization, 1990.