Machine Design Magazine February 1973-1974 Penton Plastics/Elastomers Reference

Machine Design Magazine June 1976 Penton Mechanical Drives Reference Issue

Racer X Illustrated Aug Sept 1999 Motocross Magazine John Penton Shane Watts

Machine Design Magazine Sept 1973 Seals Reference Penton Engineering

January 1973 Dirt Bike Magazine, Bultaco or OSSA, Penton 125 Trials,CZ Carb Swap

Machine Design Magazine April 1972-73 Penton Electronic Motors Reference Issue

Machine Design Magazine Feb 1974 Metals Penton Engineering

August 1972 Dirt Bike Magazine, Sand Riding, Maico 400, Penton 125 Enduro,