Não informado. (1977). Health and Hygiene. Royal Institute of Public Health and Hygiene.
Cita Chicago Style (17a ed.)Não informado. Health and Hygiene. London: Royal Institute of Public Health and Hygiene, 1977.
Cita MLA (8a ed.)Não informado. Health and Hygiene. Royal Institute of Public Health and Hygiene, 1977.
Precaución: Estas citas no son 100% exactas.