1. Amin-Sichani, S., “Modeling of Phosphorus Transport in Surface Runoff from Agricultural Watersheds”, Ph.D. Thesis, Purdue University, W. Lafayette, Indiana, 1982, 157 pp.
2. Beasley, D. B., “ANSWERS: A Mathematical Model for Simulating the Effects of Land Use and Management on Water Quality”, Ph.D. Thesis, Purdue University, W. Lafayette, Indiana, 1977, 266 pp.
3. “ANSWERS: A Model for Watershed Planning”;Beasley;Transactions of the ASAE. St. Joseph, Michigan,1980
4. “ANSWERS Users Manual”;Beasley,1982
5. Dillaha, T. A., III, “Modeling the Particle Size Distribution of Eroded Sediments During Shallow Overland Flow”, Ph.D. Thesis, Purdue University, W. Lafayette, Indiana, 1981, 189 pp.