Walsh, P. J. Spaceflight: A historical encyclopedia. Greenwood.
Chicago Style (17th ed.) CitationWalsh, Patrick J. Spaceflight: A Historical Encyclopedia. Santa Barbara, Calif [u.a.]: Greenwood.
MLA (9th ed.) CitationWalsh, Patrick J. Spaceflight: A Historical Encyclopedia. Greenwood.
Warning: These citations may not always be 100% accurate.