Rocket Design. nytimes.com. 2011-09-14 [2011-09-14]. (原始内容存档于2013-03-08). Marcia Smith. New NASA Crew Transportation System to Cost $18 Billion Through
Lazard's Levelized Cost of Energy Version 14.0 (PDF). Lazard.com. Lazard. 2020-10-19. (原始内容存档 (PDF)于2021-01-28). 2023 Levelized Cost Of Energy+. Lazard: