Não informado. (1971). Environmental Health Review. Canadian Institute of Public Health Inspectors.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Environmental Health Review. Ontario, Canada: Canadian Institute of Public Health Inspectors, 1971.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Environmental Health Review. Canadian Institute of Public Health Inspectors, 1971.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.