Montana State University.
The Center for Invasive Species Management closed in 2015. Archives of relevant materials are available here.
Carolinas Beach Vitex Task Force.
New York State Department of Agriculture and Markets.
North Carolina Department of Agriculture and Consumer Services. Plant Industry Division. Plant Protection Section.
New York City Department of Health.
New York Invasive Species Clearinghouse.
Cornell University. Forest Health and Invasive Non-native Forest Pests.
North Carolina Invasive Plant Council.
New York State Department of Environmental Conservation.
New York Department of Environmental Conservation.
Cornell University. New York State Integrated Pest Management Program.
North Carolina Department of Agriculture and Consumer Services.
Montana Fish, Wildlife, and Parks.
North Carolina State University. College of Agriculture and Life Sciences.