Dyfyniad APA
National Research Council (U.S.). Committee on Future Roles, Challenges, and Opportunities for the U.S. Geological Survey, & ebrary, Inc. (2001). Future roles and opportunities for the U.S. Geological Survey. National Academy Press.
Dyfyniad Arddull Chicago
National Research Council (U.S.). Committee on Future Roles, Challenges, and Opportunities for the U.S. Geological Survey, and Inc ebrary. Future Roles and Opportunities for the U.S. Geological Survey. Washington, D.C.: National Academy Press, 2001.
Dyfyniad MLA
National Research Council (U.S.). Committee on Future Roles, Challenges, and Opportunities for the U.S. Geological Survey, and Inc ebrary. Future Roles and Opportunities for the U.S. Geological Survey. National Academy Press, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.