Williams, T., Moon, A., & Williams, M. (1990). Food, environment, and health: A guide for primary school teachers. World Health Organization.
Citazione stile Chigago Style (17a edizione)Williams, Trefor, Alysoun Moon, e Margaret Williams. Food, Environment, and Health: A Guide for Primary School Teachers. Geneva: World Health Organization, 1990.
Citatione MLA (9a ed.)Williams, Trefor, et al. Food, Environment, and Health: A Guide for Primary School Teachers. World Health Organization, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.