1. Demonstrations reveal value of tractor roll-over protection;Anon;Farm Safety Review,1966
2. In search of safety: Deere tells story of development of this vital safety device;Anon;Farm & Power Equipment,1967
3. Tractor operation and roll-over protective structures;Anon,1972
4. Roll-over protective structures for farm and construction tractors—a 50-year review;Arndt,1971
5. Tip-over protective structure (TOPS) for front wheel drive turf and landscape equipment;ASABE;ANSI/ASAE,2002