1. Bicycle technology;Sci. Am.,1973
2. Physics in daily life: Drag’n’Roll;Europhys. News,2004
3. Pedal power probe shows bicycles waste little energy,1999
4. The Information Architects of Encyclopaedia Britannica, “machine,” Encyclopaedia Britannica, https://www.britannica.com/facts/machine, accessed Feb. 2, 2024.