Dyfyniad APA

National Research Council (U.S.). Space Studies Board, National Academy Press (U.S.), & ebrary, Inc. (2004). Annual report 2003. National Academy Press.

Dyfyniad Arddull Chicago

National Research Council (U.S.). Space Studies Board, National Academy Press (U.S.), and Inc ebrary. Annual Report 2003. Washington, D.C.: National Academy Press, 2004.

Dyfyniad MLA

National Research Council (U.S.). Space Studies Board, et al. Annual Report 2003. National Academy Press, 2004.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.