Page 18-19 in Chapter 3 of David S. F. Portree's Humans to Mars: Fifty Years of Mission Planning, 1950 - 2000, NASA Monographs in Aerospace History Series, Number 21, February 2001. Available as NASA SP-2001-4521 (页面存档备份,存于互联网档案馆).
Page 15-16 in Chapter 3 of David S. F. Portree's Humans to Mars: Fifty Years of Mission Planning, 1950 - 2000, NASA Monographs in Aerospace History Series, Number 21, February 2001. Available as NASA SP-2001-4521 (页面存档备份,存于互联网档案馆).
Annie Platoff, Eyes on the Red Planet: Human Mars Mission Planning, 1952-1970, (1999); available as NASA/CR-2001-2089280互联网档案馆的存檔,存档日期2010-05-31. (July 2001)
Bruce Mackenzie,One Way to Mars - a Permanent Settlement on the First Mission," presented at the 1998 International Space Development Conference, May 21–25, Milwaukee WI; Abstract互联网档案馆的存檔,存档日期2013-11-13.
Geoffrey A. Landis, "Footsteps to Mars: an Incremental Approach to Mars Exploration," Journal of the British Interplanetary Society, Vol. 48, pp. 367-342 (1995); presented at Case for Mars V, Boulder CO, 26–29 May 1993; appears in From Imagination to Reality: Mars Exploration Studies, R. Zubrin, ed., AAS Science and Technology Series Volume 91 pp. 339-350 (1997). (text available as Footsteps to Mars pdf file (页面存档备份,存于互联网档案馆)
Page 18-19 in Chapter 3 of David S. F. Portree's Humans to Mars: Fifty Years of Mission Planning, 1950 - 2000, NASA Monographs in Aerospace History Series, Number 21, February 2001. Available as NASA SP-2001-4521 (页面存档备份,存于互联网档案馆).
Page 15-16 in Chapter 3 of David S. F. Portree's Humans to Mars: Fifty Years of Mission Planning, 1950 - 2000, NASA Monographs in Aerospace History Series, Number 21, February 2001. Available as NASA SP-2001-4521 (页面存档备份,存于互联网档案馆).
Annie Platoff, Eyes on the Red Planet: Human Mars Mission Planning, 1952-1970, (1999); available as NASA/CR-2001-2089280互联网档案馆的存檔,存档日期2010-05-31. (July 2001)
Geoffrey A. Landis, "Footsteps to Mars: an Incremental Approach to Mars Exploration," Journal of the British Interplanetary Society, Vol. 48, pp. 367-342 (1995); presented at Case for Mars V, Boulder CO, 26–29 May 1993; appears in From Imagination to Reality: Mars Exploration Studies, R. Zubrin, ed., AAS Science and Technology Series Volume 91 pp. 339-350 (1997). (text available as Footsteps to Mars pdf file (页面存档备份,存于互联网档案馆)
NASA, Report of the 90-day study on human exploration of the Moon and Mars, published 11/1989; abstract (页面存档备份,存于互联网档案馆)
Dwayne Day, "Aiming for Mars, grounded on Earth," The Space Review February 16, 2004 link (页面存档备份,存于互联网档案馆)
Bruce Mackenzie,One Way to Mars - a Permanent Settlement on the First Mission," presented at the 1998 International Space Development Conference, May 21–25, Milwaukee WI; Abstract互联网档案馆的存檔,存档日期2013-11-13.