Confined Space Program Resources
- Oklahoma State University - Entering and Working in Confined Spaces
- OSHA Permit-Required Confined Spaces 1910.146
- OSHA Safety and Health Topics: Confined Spaces
- E-Laws: OSHA Confined Space Advisor, U.S. Department of Labor
- NIOSH Criteria Documents: Criteria for a Recommended Standard: Working in Confined Spaces
- Confined Spaces: Hazards and Possible Solutions, U.S. Department of Labor