«Aerospace Daily & Defense Report New Rocket, White Tails In ULA’s Long-Term Strategy». Aviation Week, 17-02-2015 [Consulta: 22 febrer 2015]. «[the] plan to field a new rocket engine with Blue Origin called the BE-4 is only step one of a larger strategic plan to take the company from a sole-source benefactor mentality to competing in a burgeoning commercial market. ... The Atlas V and Delta IV ... both have a limited future.»
