Dyfyniad APA

Ripple, W. J. (1989). Fundamentals of geographic information systems: A compendium. American Society for Photogrammetry and Remote Sensing, and American Congress on Surveying and Mapping.

Dyfyniad Arddull Chicago

Ripple, William J. Fundamentals of Geographic Information Systems: A Compendium. Bethesda, Md: American Society for Photogrammetry and Remote Sensing, and American Congress on Surveying and Mapping, 1989.

Dyfyniad MLA

Ripple, William J. Fundamentals of Geographic Information Systems: A Compendium. American Society for Photogrammetry and Remote Sensing, and American Congress on Surveying and Mapping, 1989.

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