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Citace podle Chicago (17th ed.)Human Spaceflight: A Record of Achievement, 1961-2006 / Compiled by Judith A. Rumerman ; Updated by Chris Gamble and Gabriel Okolski. 2007.
Citace podle MLA (9th ed.)Human Spaceflight: A Record of Achievement, 1961-2006 / Compiled by Judith A. Rumerman ; Updated by Chris Gamble and Gabriel Okolski. 2007.
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