International Symposium on Spatial Data Handling Edinburgh, Scotland, International Geographical Union. Commission on GIS, Association for Geographic Information, Waugh, T. C., & Healey, R. G. (1994). Advances in GIS research: Proceedings of the Sixth International Symposium on Spatial Data Handling. Taylor & Francis.
Chicago-referens (17:e uppl.)International Symposium on Spatial Data Handling Edinburgh, Scotland, International Geographical Union. Commission on GIS, Association for Geographic Information, Thomas C. Waugh, och Richard G. Healey. Advances in GIS Research: Proceedings of the Sixth International Symposium on Spatial Data Handling. London: Taylor & Francis, 1994.
MLA-referens (9:e uppl.)International Symposium on Spatial Data Handling Edinburgh, Scotland, et al. Advances in GIS Research: Proceedings of the Sixth International Symposium on Spatial Data Handling. Taylor & Francis, 1994.