References  
   

Anderson, Charles M., Native Plant Alliance: A manual of native plant communities for urban areas of the Pacific Northwest, 1996.

 
   
Bassuk, Nina, Urban Horticulture Institute, Structural Soil: An innovative medium under pavement that improves street tree vigor, 1997.  
   
http://www.hort.cornell.edu/department/faculty/bassuk/uhi/pubs.html  
   
City of Seattle Urban Forest Coalition & Arai/ Jackson Architects and Planners. A City Among the Trees: An urban forestry resource guide. City of Seattle Urban Forest Coalition, 1998.  
   
King County Metro, West Point Treatment Plant Vegetation and Habitat Study. King County Metro, 1989.  
   
Mortberg, Ulla and Wallentinus, Hans, Georg, "Red-listed forest bird species in an urban environment: Assessment of green space corridors." Landscape and Urban Planning. (August 30, 2000): 50 (4): 215-226.  
   
Urban, James, "Room To Grow." Landscape Architecture. (March 1996): 86 (3): 74-79, 96-97.  
   
Urban, James, "New Approaches to Planting Trees in Urban Areas", http://www.sodaq.cq.ca/realisations/colloque_99/urban-an.html  
   
Additional sources of information  
The International Society of Arboriculture (ISA), 1997. "Principles and Practice of Planting Trees and Shrubs"

American Institute of Architects (AIA), 1998. "Architectural Graphic Standards 1998 Cumulative Supplement"