Johnson-Freese, J.(2005). Maintaining US leadership in human spaceflight. Space Policy, 21(4), 239-242. doi:10.1016/j.spacepol.2005.08.001
MLA CitationJohnson-Freese, Joan. "Maintaining US Leadership in Human Spaceflight". Space Policy, 21.4 ( 2005 ): 239-242.
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