1. Agriculture and Agri-Food Canada. Ontario Land Resources Unit. 1994. Database Catalogue, Digital Geographical Data Available for Ontario. Guelph, Ontario, Canada.
2. Beak Consultants Ltd. 1989. Modelling the Loss of Atrazine and Phosphorus in a Southwestern Ontario Agricultural Watershed. A final project report prepared for: Ontario Ministry of the Environment, Toronto, Ontario, Canada.
3. 1994. PEST: a Unique Computer Program for Model-Independent Parameter Optimisation. Watermark Computing: Washington, DC.
4. 1976. Modelling Nonpoint Pollution from the Land surface. Environmental Research Laboratory. Office of Research and Development. US Environmental Protection Agency. EPA-600/3-76-083.