American Congress on Surveying and Mapping, American Society for Photogrammetry and Remote Sensing, & Ripple, W. J. (1989). Fundamentals of geographic information systems: A compendium. American Congress on Surveying and Mapping, American Society for Photogrammetry and Remote Sensing.
Παραπομπή σε μορφή Chicago (17η εκδ.)American Congress on Surveying and Mapping, American Society for Photogrammetry and Remote Sensing, και William J. Ripple. Fundamentals of Geographic Information Systems: A Compendium. Bethesda: American Congress on Surveying and Mapping, American Society for Photogrammetry and Remote Sensing, 1989.
Παραπομπή σε μορφή MLA (9th εκδ.)American Congress on Surveying and Mapping, et al. Fundamentals of Geographic Information Systems: A Compendium. American Congress on Surveying and Mapping, American Society for Photogrammetry and Remote Sensing, 1989.