1. 1. Regolith. URL: https://en.wikipedia.org/wiki/Regolith/ (Last accessed: 02.01.2019).
2. 2. Lunar-regolith. URL: http://www.universetoday.com/20360/lunar-regolith/ (Last accessed: 02.01.2019).
3. 3. Lunar soil. URL: https://en.wikipedia.org/wiki/ Lunar_soil/ (Last accessed: 02.01.2019).
4. 4. Bazalt. URL: https://ru.wikipedia.org/wiki/%D0%91%D0%B0%D0%B7% D0%B0%D0%BB%D1%8C%D1%82 (Last accessed: 02.01.2019).
5. 5. Bazalt. URL: http://www.mining-enc.ru/b/bazalt/ (Last accessed: 02.01.2019).