The case for Mars IV: The international exploration of Mars ; proceedings of the fourth Case for Mars Conference held June 4 - 8, 1990, at the University of Colerado, Boulder, Colorado. Univelt.
Chicago-Zitierstil (17. Ausg.)The Case for Mars IV: The International Exploration of Mars ; Proceedings of the Fourth Case for Mars Conference Held June 4 - 8, 1990, at the University of Colerado, Boulder, Colorado. San Diego, Calif: Univelt.
MLA-Zitierstil (9. Ausg.)The Case for Mars IV: The International Exploration of Mars ; Proceedings of the Fourth Case for Mars Conference Held June 4 - 8, 1990, at the University of Colerado, Boulder, Colorado. Univelt.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.