Workers Health & Safety Centre, 2020. “Confronting COVID-19: Implementing the Precautionary Principle and Hierarchy of Hazard Controls.” Webinar. April 22, 2020.

https://www.whsc.on.ca/Files/Resources/COVID-19-Resources/WHSC-WebinarPP_Precautionary-Principle-Hierarchy-of-Controls-b_Apr22-20_COVID-19-Resources.aspx