The next 40 years in space: Selected papers presented at the 40th congress of the International Astronautical Federation, Torremolinos/Malaga, Spain, 7 - 13 October 1989. Pergamon Press.
Chicago-Zitierstil (17. Ausg.)The Next 40 Years in Space: Selected Papers Presented at the 40th Congress of the International Astronautical Federation, Torremolinos/Malaga, Spain, 7 - 13 October 1989. Oxford u.a: Pergamon Press.
MLA-Zitierstil (9. Ausg.)The Next 40 Years in Space: Selected Papers Presented at the 40th Congress of the International Astronautical Federation, Torremolinos/Malaga, Spain, 7 - 13 October 1989. Pergamon Press.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.