Dyfyniad APA

(1996). Manual on GIS for planners and decision makers. United Nations.

Dyfyniad Arddull Chicago

Manual on GIS for Planners and Decision Makers. New York: United Nations, 1996.

Dyfyniad MLA

Manual on GIS for Planners and Decision Makers. United Nations, 1996.

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