Green Street Systems Tree Box Filters
http://www.treeboxfilter.com

Low Impact Development Urban Design Tools
http://www.lid-stormwater.net/treeboxfilter_home.htm

Ohio EPA, Division of Surface Water Storm Water Post-Construction Questions & Answers
http://www.epa.state.oh.us/dsw/storm/CGPPCQA.aspx#07

University of New Hampshire Tree Box Filter Fact Sheet
http://www.unh.edu/erg/cstev/fact_sheets/tree_filter_fact_sheet_08.pdf

United States EPA, Stormwater Management Best Practices http://www.epa.gov/oaintrnt/stormwater/best_practices.htm#treeboxfilters