Logsdon, J M.(1989). A sustainable rationale for manned space flight. Space Policy, 5(1), 3-6. doi:10.1016/0265-9646(89)90023-4
MLA CitationLogsdon, John M. "A Sustainable Rationale for Manned Space Flight". Space Policy, 5.1 ( 1989 ): 3-6.
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