Ricketts, T. H. (1999). Terrestrial ecoregions of North America: A conservation assessment. Island Press.
Chicago Style (17th ed.) CitationRicketts, Taylor H. Terrestrial Ecoregions of North America: A Conservation Assessment. Washington, D.C.: Island Press, 1999.
MLA (9th ed.) CitationRicketts, Taylor H. Terrestrial Ecoregions of North America: A Conservation Assessment. Island Press, 1999.
Warning: These citations may not always be 100% accurate.