1. Specification for Non-metallic Spur Gears;BS 6168,1987
2. Polypenco Gears Design;Polypenco,1985
3. ESDU, Design of Parallel Axis Straight Spur and Helical Non-metallic Gears-choice of Material and Load Capacity, Item 68001, September 1977.
4. K. Mao, The Performance of Dry Running Non-metallic Gears, The University of Birmingham, PhD Thesis, 1993.
5. A comparison of ratings for plastic gears;Walton;Proc. Instit. Mech. Eng., Part C,1989