Não informado. (1977). Health and Hygiene. Royal Institute of Public Health and Hygiene.
Chicago-Zitierstil (17. Ausg.)Não informado. Health and Hygiene. London: Royal Institute of Public Health and Hygiene, 1977.
MLA-Zitierstil (8. Ausg.)Não informado. Health and Hygiene. Royal Institute of Public Health and Hygiene, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.