WHO's guidance and advice on the use of masks to protect against and limit the spread of COVID-19.
When and how to use masks
Advice on the Use of Masks during COVID-19 - Cyprus Refugee Council
When Should You Use a Mask? - Covid-19 Communication Network
Simple instructions on how to use a face mask – Africa CDC
Coronavirus (COVID-19) – Do I need to wear a mask?
Association of State-Issued Mask Mandates and Allowing On-Premises
Cloth face mask - Wikipedia
Face masks and COVID-19: All you need to know
How to Properly Wear a Face Mask: Infographic