• A Comparative Analysis of the Capital and Maintenance Costs of Sustainable and Conventional Landscape Design. Article by Gary Lewis in the University of Florida Journal of Undergraduate Research, Volume 7, Issue 1 - September/October 2005

http://www.clas.ufl.edu/jur/200509/papers/paper_lewis.html

• Decision Analysis Publications: Probabilistic Publishing (Dave and Debbie Charlesworth)

http://www.decisions-books.com