1. Aangeenbrug, R. T. (Ed), (1980): Proceedings of the International Symposium on Cartography and Computing: Applications in Health and Environment. Auto Carto IV, Falls Church, Va., American Congress on Surveying and Mapping and American Society of Photogrammetry, 2 volumes: Vol. 1, 623 pp., Vol. 2, 479 pp.
2. A method of estimating area in irregularly-shaped and broken figures;Abell;J. For.,1939
3. ACIC (1962): Map Accuracy Evaluation. Part 1. Evaluation of Horizontal Map Information. Aeronautical Charting and Information Center Reference Publication No. 2. St. Louis, 46 pp.
4. ACIC (1963): Map Accuracy Evaluation. Part 2. Evaluation of Vertical Map Information. Aeronautical Charting and Information Centre Reference Publication No. 2, St. Louis, 46 pp.
5. ACSM (1976): Proceedings of the International Conference on Automation in Cartography. “Auto Carto I”. Falls Church, Va., American Congress on Surveying and Mapping, 318 pp.