1. William C Feldman, Sylvestre Maurice, David Jeffery Lawrence, Robert C Little, SL Lawson, O Gasnault, Roger C Wiens, Bruce L Barraclough, Richard C Elphic, Thomas H Prettyman, et al. Evidence for water ice near the lunar poles. Journal of Geophysical Research: Planets, 106(E10):23231–23251, 2001.
2. R Sridharan, SM Ahmed, Tirtha Pratim Das, P Sreelatha, P Pradeepkumar, Neha Naik, and Gogulapati Supriya. ‘Direct’ evidence for water (H2O) in the sunlit lunar ambience from CHACE on MIP of Chandrayaan I. Planetary and Space Science, 58(6):947–950, 2010.
3. Shuai Li, Paul G Lucey, Ralph E Milliken, Paul O Hayne, Elizabeth Fisher, Jean-Pierre Williams, Dana M Hurley, and Richard C Elphic. Direct evidence of surface exposed water ice in the lunar polar regions. Proceedings of the National Academy of Sciences, 115(36):8907–8912, 2018.
4. Leonard David. Moon Rush: The New Space Race. National Geographic Books, 2019.
5. Diane Davis, Sagar Bhatt, Kathleen Howell, Jiann-Woei Jang, Ryan Whitley, Fred Clark, Davide Guzzetti, Emily Zimovan, and Gregg Barton. Orbit maintenance and navigation of human spacecraft at cislunar near rectilinear halo orbits. In 27th AAS/AIAA Space Flight Mechanics Meeting, San Antonio, Texas, February 5–9, 2017. American Astronautical Society, 2017.