; Femminineo, Mark G.; Koelfgen, Syri J.; Lepsch, Roger A.; Ryan, Richard M.; Taylor, Steven A.«Draft Launch Propulsion Systems Roadmap: Technology Area 01». NASA, 01-11-2010. Arxivat de l'original el 2016-03-24. [Consulta: 17 abril 2016]. «Small: 0–2 t payloads; Medium: 2–20 t payloads; Heavy: 20–50 t payloads; Super Heavy: > 50 t payloads»
«Seeking a Human Spaceflight Program Worthy of a Great Nation» p. 64-66. NASA, 01-10-2009. Arxivat de l'original el 2019-02-16. [Consulta: 17 abril 2016]. «...the U.S. human spaceflight program will require a heavy-lift launcher ... in the range of 25 to 40 mt ... this strongly favors a minimum heavy-lift capacity of roughly 50 mt....»
; Femminineo, Mark G.; Koelfgen, Syri J.; Lepsch, Roger A.; Ryan, Richard M.; Taylor, Steven A.«Draft Launch Propulsion Systems Roadmap: Technology Area 01». NASA, 01-11-2010. Arxivat de l'original el 2016-03-24. [Consulta: 17 abril 2016]. «Small: 0–2 t payloads; Medium: 2–20 t payloads; Heavy: 20–50 t payloads; Super Heavy: > 50 t payloads»
«Seeking a Human Spaceflight Program Worthy of a Great Nation» p. 64-66. NASA, 01-10-2009. Arxivat de l'original el 2019-02-16. [Consulta: 17 abril 2016]. «...the U.S. human spaceflight program will require a heavy-lift launcher ... in the range of 25 to 40 mt ... this strongly favors a minimum heavy-lift capacity of roughly 50 mt....»
«STS-93». Shuttlepresskit.com. Arxivat de l'original el 18 gener 2000.
«Falcon Heavy». SpaceX. Arxivat de l'original el 6 d’abril 2017. [Consulta: 8 abril 2017].