National Park Service. 2009. NPS Explore Biology: Invasives Species Management. Webpage updated 8/12/2009.
Pimentel, D., Lach, L., Zuniga, R. and Morrison, D. 2005. Update on the environmental and economic costs associated with alien-invasive species in the United States. Ecological Economics 52. 273- 288. (200 KB PDF)
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