- Urban Forest Ecosystems Institute's "SelecTree"
- www.scenic.org/tree/environmental?
- Tree Link - Cool all-purpose urban forestry website
- California Urban Forests Council: www.CaUFC.org
- California Department of Forestry: www.fire.ca.gov/ResourceManagement/UrbanForestry.asp
- Western Chapter of the International Society of Arborculture: www.wcisa.net
- www.treesaregood.com: a Consumer Tree Site from the International Society of Arboriculture