1. Ad Hoe Water Resources Council , 1964 . Evaluation Standards for Primary Outdoor Recreation Benefits. Supplement No. 1 to Senate Document 97 (June 4).
2. R. C. Agarwal, and E. O. Heady , 1972 . Operations Research Methods for Agricultural Decisions . Iowa State University Press, Ames, Iowa, 303 pp.
3. M. H. Anderson , 1973 . The Demand for Agricultural Water. Utah Water Research Laboratory, PRWG 100-4.
4. Criteria for social investment
5. Estimates o the risks associated with dam failure