1. A general theory of the unit hydrograph
2. W. H. Espey, D. G. Altman, and C. B. Graves , 1977 . Nomographs for Ten-Minute Unit Hydrographs for Small Urban Watersheds . Addendum 3 of the ASCE Report "Urban Runoff Control Planning, June 1977." pp.4 -28 to4 -28 .
3. Synthetic unit-graphs
4. U.S. Soil Conservation Service , 1972 . Engineering Handbook, Section 4. Hydrology Section, pp.1 -1 to1 -1 .