Não informado. (1977). Health and Hygiene. Royal Institute of Public Health and Hygiene.
Style de citation Chicago (17e éd.)Não informado. Health and Hygiene. London: Royal Institute of Public Health and Hygiene, 1977.
Style de citation MLA (8e éd.)Não informado. Health and Hygiene. Royal Institute of Public Health and Hygiene, 1977.
Attention : ces citations peuvent ne pas être correctes à 100%.