APA (7th ed.) Citation

Walsh, P. J. Spaceflight: A historical encyclopedia. Greenwood.

Chicago Style (17th ed.) Citation

Walsh, Patrick J. Spaceflight: A Historical Encyclopedia. Santa Barbara, Calif [u.a.]: Greenwood.

MLA (9th ed.) Citation

Walsh, Patrick J. Spaceflight: A Historical Encyclopedia. Greenwood.

Warning: These citations may not always be 100% accurate.