(en) Virginia P. Dawson et Mark D. Bowles, Taming liquid hydrogen : The Centaur upper stage rocket (1958 - 2002), NASA, , 289 p. (lire en ligne [PDF]), p. 4.
(en) Virginia P. Dawson et Mark D. Bowles, Taming liquid hydrogen : The Centaur upper stage rocket (1958 - 2002), NASA, , 289 p. (lire en ligne [PDF]), p. 1 à 13.
(en) Virginia P. Dawson et Mark D. Bowles, Taming liquid hydrogen : The Centaur upper stage rocket (1958 - 2002), NASA, , 289 p. (lire en ligne [PDF]), p. 17 à 21.
(en) Virginia P. Dawson et Mark D. Bowles, Taming liquid hydrogen : The Centaur upper stage rocket (1958 - 2002), NASA, , 289 p. (lire en ligne [PDF]), p. 46 à 47.
(en) Virginia P. Dawson et Mark D. Bowles, Taming liquid hydrogen : The Centaur upper stage rocket (1958 - 2002), NASA, , 289 p. (lire en ligne [PDF]), p. 82.
(en) Virginia P. Dawson et Mark D. Bowles, Taming liquid hydrogen : The Centaur upper stage rocket (1958 - 2002), NASA, , 289 p. (lire en ligne [PDF]), p. 84.
(en) Virginia P. Dawson et Mark D. Bowles, Taming liquid hydrogen : The Centaur upper stage rocket (1958 - 2002), NASA, , 289 p. (lire en ligne [PDF]), p. 85.
(en) Roger E. Bilstein, Stages to Saturn; A Technological History of the Apollo/Saturn Launch Vehicles, Washington, D.C., NASA History Office, (lire en ligne), chap. 5 (« Unconventional Cryogenics: RL-10 and J-2 »)
Zegler et Bernard Kutter, « Evolving to a Depot-Based Space Transportation Architecture » [archive du ], AIAA SPACE 2010 Conference & Exposition, AIAA, (consulté le ) : « ACES design conceptualization has been underway at ULA for many years. It leverages design features of both the Centaur and Delta Cryogenic Second Stage (DCSS) upper stages and intends to supplement and perhaps replace these stages in the future. ... »
Zegler et Bernard Kutter, « Evolving to a Depot-Based Space Transportation Architecture » [archive du ], AIAA SPACE 2010 Conference & Exposition, AIAA, (consulté le ) : « ACES design conceptualization has been underway at ULA for many years. It leverages design features of both the Centaur and Delta Cryogenic Second Stage (DCSS) upper stages and intends to supplement and perhaps replace these stages in the future. ... »