Dyfyniad APA
National Research Council (U.S.). Committee to Improve the U.S. Geological Survey National Water-Quality Assessment Program & ebrary, Inc. (2002). Opportunities to improve the U.S. Geological Survey National Water Quality Assessment Program. National Academy Press.
Dyfyniad Arddull Chicago
National Research Council (U.S.). Committee to Improve the U.S. Geological Survey National Water-Quality Assessment Program and Inc ebrary. Opportunities to Improve the U.S. Geological Survey National Water Quality Assessment Program. Washington, D.C. ; [Great Britain]: National Academy Press, 2002.
Dyfyniad MLA
National Research Council (U.S.). Committee to Improve the U.S. Geological Survey National Water-Quality Assessment Program and Inc ebrary. Opportunities to Improve the U.S. Geological Survey National Water Quality Assessment Program. National Academy Press, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.