Jeanette Knutson-Pedersen; California Department of Forestry and Fire Protection (July 2005). "Tree Notes"(PDF). Fire Safe Landscaping. Plumas Fire Safe Council. Archived from the original(PDF) on 2008-05-10. Retrieved 2008-03-02.
Jeanette Knutson-Pedersen; California Department of Forestry and Fire Protection (July 2005). "Tree Notes"(PDF). Fire Safe Landscaping. Plumas Fire Safe Council. Archived from the original(PDF) on 2008-05-10. Retrieved 2008-03-02.