View of Effectiveness of manufactured surgical masks, respirators, and home-made masks in prevention of respiratory infection due to airborne microorganisms

Still Confused About Masks? Here's the Science Behind How Face Masks Prevent Coronavirus

Face masks and respirators in the fight against the COVID-19 pandemic: An overview of the standards and testing methods - ScienceDirect

Frontiers Cotton and Surgical Face Masks in Community Settings: Bacterial Contamination and Face Mask Hygiene

Efficacy of masks and face coverings in controlling outward aerosol particle emission from expiratory activities

COMMENTARY: Wear a respirator, not a cloth or surgical mask, to protect against respiratory viruses

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Face masks during the COVID-19 pandemic - Wikipedia

A technical review of face mask wearing in preventing respiratory COVID-19 transmission - ScienceDirect

Protective face mask: an effective weapon against SARS-CoV-2 with controlled environmental pollution