1. .
2. Federal Motor vehicle Safety Standard No. 216 – Roof Crush Resistance. CFR 49 571.216, October 1997.
3. SAE J996, Inverted Vehicle Drop Test Procedure, August 1967.
4. SAE J2114, Dolly Rollover Recommended Test Procedure, February 2011.
5. Federal Motor vehicle Safety Standard No. 216 – Roof Crush Resistance. CFR 49 571 and 585, Docket No. NHTSA-2009-0093.