Não informado. (1971). Environmental Health Review. Canadian Institute of Public Health Inspectors.
Chicago-Zitierstil (17. Ausg.)Não informado. Environmental Health Review. Ontario, Canada: Canadian Institute of Public Health Inspectors, 1971.
MLA-Zitierstil (8. Ausg.)Não informado. Environmental Health Review. Canadian Institute of Public Health Inspectors, 1971.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.