1. Sewage sludge: Land utilization and the Environment, ed. C. E. Clapp, W. E. Larson and R. H. Dowdy, American Society of Agronomy, Inc., Madison, WI, 1994
2. Management Experiences and Trends for Water Reuse Implementation in Northern California
3. Water reuse for irrigation: agriculture, landscapes, and turf grass, ed. V. Lazarova and A. Bahri, CRC Press, 2004
4. Human urine as a source of alternative natural fertilizer in agriculture: A flight of fancy or an achievable reality
5. M. Johansson , H.Jönsson, C.Höglund, A.Richert Stintzing and L.Rodhe, Final Rep. R&D Proj. Source-Separated Hum. Urin. – a Futur. source Fertil. Agric. Stock. Reg., 2001