User:Adevroy501/Wheel/Bibliography


 * 1) Müller, Prof. Dr. Johannes (11 April 2022). "3400 BC: The oldest evidence for the use of the wheel and wagon originates from Northern Germany". CAU Kiel.
 * 2) Piska, Raghu (19 November 2015). "Sliding and Rolling friction". StackExchange.
 * 3) Hirst, K. Kris (26 August 2020). "The Invention of the Wheel and Wheeled Vehicles". ThoughtCo