Dyfyniad APA
ebrary, Inc. (1994). Material fluxes on the surface of the earth. National Academy Press.
Dyfyniad Arddull Chicago
ebrary, Inc. Material Fluxes on the Surface of the Earth. Washington, D.C.: National Academy Press, 1994.
Dyfyniad MLA
ebrary, Inc. Material Fluxes on the Surface of the Earth. National Academy Press, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.