1. NASA's Lunar Exploration Program Overview,2020
2. China's New Moon Mission Returns the First Lunar Samples since 1976;Jones,2020
3. JAXA, About Asteroid Explorer “Hayabusa2”. https://global.jaxa.jp/projects/sas/hayabusa2/index.html (accessed 17 November 2021).
4. M. Wall, 50 years after Apollo 11, a new moon rush is coming. https://www.space.com/moon-exploration-plans-nasa-india-china-and-more.html (accessed 23 July 2021).
5. Blue Origin, Inc. has announced the long-term sustainability approach to stay on the Moon, including developing lunar resources for Oxygen/Hydrogen propellants and provide power. Please see Blue Origin, This time to stay. https://www.blueorigin.com/blue-moon/national-team (accessed 23 July 2021).