APA (7th ed.) Citation

Southern Weed Science Society (U.S.), Thundersnow Interactive, & DeFelice, M. S. (2004). Interactive encyclopedia of North American weeds (Version 3.0.). Southern Weed Science Society.

Chicago Style (17th ed.) Citation

Southern Weed Science Society (U.S.), Thundersnow Interactive, and Michael S. DeFelice. Interactive Encyclopedia of North American Weeds. Version 3.0. Champaign, Ill: Southern Weed Science Society, 2004.

MLA (9th ed.) Citation

Southern Weed Science Society (U.S.), et al. Interactive Encyclopedia of North American Weeds. Version 3.0. Southern Weed Science Society, 2004.