1. Non-parametric Tests for Complete Data
2. Black and Veatch 2013 2014 Stormwater Utility Survey http://bv.com/docs/default-source/management-consulting-brochures/2014-stormwater-utility-survey accessed
3. Forest Cover, Impervious-Surface Area, and the Mitigation of Stormwater Impacts;Booth;Journal of the American Water Resources Association,2002
4. Busco , D. G. Lindsey 2001 An Internet Guide to Stormwater Financing. Center for Urban Policy and the Environment at Indiana University-Purdue University Indianapolis (IUPUI) http://stormwaterfinance.urbancenter.iupui.edu/ accessed