National Research Council (U.S.). Space Studies Board, National Academy Press (U.S.), & ebrary, Inc. (1999). Annual report. National Academy Press.
Lua i Stíl Chicago (17ú heag.)National Research Council (U.S.). Space Studies Board, National Academy Press (U.S.), agus Inc ebrary. Annual Report. Washington, D.C.: National Academy Press, 1999.
Lua MLA (9ú heag.)National Research Council (U.S.). Space Studies Board, et al. Annual Report. National Academy Press, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.