Dyfyniad APA

National Research Council (U.S.). Committee on U.S. Geological Survey Water Resources Research. (1997). Watershed research in the U.S. Geological Survey. National Academy Press.

Dyfyniad Arddull Chicago

National Research Council (U.S.). Committee on U.S. Geological Survey Water Resources Research. Watershed Research in the U.S. Geological Survey. Washington, D.C.: National Academy Press, 1997.

Dyfyniad MLA

National Research Council (U.S.). Committee on U.S. Geological Survey Water Resources Research. Watershed Research in the U.S. Geological Survey. National Academy Press, 1997.

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