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  • "Cold Hardiness Zones & Heat Zones As They Affect Your Landscape." Parker County Master Garden Association. (Dec. 12, 2008)
  • Glasener, Erica and Reeves, Walter. "Georgia Gardener's Guide." Cool Springs Press. 2004. (Dec. 12, 2008)
  • "Idaho's Growing Regions." Idaho Landscapes & Gardens. University of Idaho Extension. (Dec. 12, 2008)
  • O'Malley, Therese and Treib, Marc. "Regional Gardening Design in the United States." Dumbarton Oaks. 1995. (Dec. 12, 2008)
  • "The Regional Garden section of the National Garden." U.S. Botanical Garden. (Dec. 12, 2008)
  • "USDA Hardiness Zone Finder." National Gardening Association. (Dec. 12, 2008)