1. Arba, A. (2023, February 10). Sales volume of leading motorcycle brands in Japan 2022. Statista. Retrieved from https://www.statista.com/statistics/1233676/japan-motorcycle-sales-by-domestic-brand/
2. Carter, T. (2016, November 3). Honda and Yamaha in talks to work together on range of bikes - yeah, really. MoreBikes. Retrieved from https://www.morebikes.co.uk/news/32833/honda-yamaha-talks-work-together-range-bikes-yeah-really/
3. Edge, D. (2002, June 7). Suzuki Press Release Explains Suzuki/Kawasaki Alliance. Motorcycledaily. Retrieved from https://www.motorcycledaily.com/2002/06/07june02suzkawalliance/
4. Elrado, J. (2020). Oligopoly. Principles of Economics Scarcity and Social Provisioning 2nd Ed. (pp. 385-398). Open Oregon Educational Resources https://openoregon.pressbooks.pub/socialprovisioning2/chapter/13-2-oligopoly/
5. Fujiwara-Greve, T. (2015). Non-cooperative game theory. Springer. https://doi.org/10.1007/978-4-431-55645-9