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| Training Mask Apollo (available [online] Apr. 2, 2021). Retrieved from the internet Dec. 16, 2021 from URL: https://www.amazon.com/Training-Mask-Filtration-Woodworking-Activated/dp/B091MDYSHP/ (Year: 2021). |
| DK177 Half Respirator (available [online] May 12, 2020). Retrieved from the internet Dec. 16, 2021 from URL: https://www.amazon.com/Respirator-Replaceable-Reusable-Polishing-Protection/dp/B088JXSKHP/ (Year: 2020). |
| https://totobobo.com/blog/chinese-patent-opens-up-new-market-opportunity-for-totobobo/. |
| https://3dprintingcenter.net/copper-3d-makes-the-free-n95-mask-design-to-fight-covid-19-pandemic-spread/. |