- American industrial hygiene association
- Canada´s national occupational health & safety resource
- CDC office of health and safety / hearing conservation program
- Enciclopedia de Salud y Seguridad en el Trabajo
- Instituto Nacional de Salud de los Trabajadores (INSAT)
- National Institute for Occupational Safety and Health (NIOSH)
- National Institute of Environmental Health Sciences (NIEHS) / Hearing conservation program
- Noise induced hearing loss and its prevention
- Occupational safety & health administration (OSHA)