1. Colorado River Compact of 1922 Washington http://www.usbr.gov/lc/region/pao/pdfiles/crcompct.pdf 2005
2. Gregg , T. 1994 Xeriscaping: Promises and Pitfalls City of Austin, Texas
3. Nelson , J. 1994 Water Saved By Single Family Xeriscapes Proc. 1994 AWWA Ann. Conf. New York