1. Bureau of Labor Statistics. 2002. U.S. Department of Labor. Respirator. Use and practices [accessed 2020 June 22]. https://www.bls.gov/iif/oshwc/osh/os/osnr0014.txt.
2. Centers for Disease Control and Prevention. 2007. National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory [accessed 2020 June 22]. https://www.cdc.gov/niosh/npptl/stps/pdfs/TEB-CBRN-APR-STP-0313-508.pdf.
3. Centers for Disease Control and Prevention. 2018. National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory. Section 1: NIOSH-approved respirators [accessed 2020 June 22]. https://www.cdc.gov/niosh/npptl/topics/respirators/disp_part/respsource1quest3.html.
4. Centers for Disease Control and Prevention. 2020. National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory [accessed 2020 June 22]. https://www.cdc.gov/niosh/npptl/stps/pdfs/CVB-APR-STP-0089-508.pdf.
5. Chemical protective clothing; a study into the ability of staff to perform lifesaving procedures