PRISM Climate Group & United States. Agricultural Research Service. (2012). USDA plant hardiness zone map (2012 [edition].). Agricultural Research Service ; Oregon State University.
Chicago Style (17th ed.) CitationPRISM Climate Group and United States. Agricultural Research Service. USDA Plant Hardiness Zone Map. 2012 [edition]. [Washington, D.C.] : [Corvallis, Oregon]: Agricultural Research Service ; Oregon State University, 2012.
MLA (9th ed.) CitationPRISM Climate Group and United States. Agricultural Research Service. USDA Plant Hardiness Zone Map. 2012 [edition]. Agricultural Research Service ; Oregon State University, 2012.
Warning: These citations may not always be 100% accurate.