Não informado. (1973). WHO Offset Publication. World Health Organization.
Style de citation Chicago (17e éd.)Não informado. WHO Offset Publication. Geneva, Suíça: World Health Organization, 1973.
Style de citation MLA (8e éd.)Não informado. WHO Offset Publication. World Health Organization, 1973.
Attention : ces citations peuvent ne pas être correctes à 100%.