Jalil, F., Firdaus, E. Safrianti, and A. Hidayat. “The Design of Portable Battery Charging Devices Using Motorcycle Wheel Round”. International Journal of Electrical, Energy and Power System Engineering, Vol. 2, no. 3, Oct. 2019, pp. 21-25, doi:10.31258/ijeepse.2.3.21-25.