Bringing Mars Back To Earth. NASA. 26 April 2018. (原始内容存档于2021-12-22). 本文含有此來源中屬於公有领域的内容。 Foust, Jeff. Mars sample return mission plans begin to take shape.
instincts; The West, served by Arab "moderates", is attempting to take the Arab world back to the Stone Age (页面存档备份,存于互联网档案馆), 5 October 2006, Al-Ahram Weekly
(原始内容存档于2021-03-09). Map of Countires Supporting the Proliferation Security Initiative. [31 March 2015]. (原始内容存档于2015-07-14). Iraqi Volunteers Fighting For