United States. Animal and Plant Health Inspection Service. (2003). Witchweed: A parasitic pest. U.S. Dept. of Agriculture, Animal and Plant Health Inspection Service.
Chicago Style (17th ed.) CitationUnited States. Animal and Plant Health Inspection Service. Witchweed: A Parasitic Pest. [Riverdale, Md.]: U.S. Dept. of Agriculture, Animal and Plant Health Inspection Service, 2003.
MLA (9th ed.) CitationUnited States. Animal and Plant Health Inspection Service. Witchweed: A Parasitic Pest. U.S. Dept. of Agriculture, Animal and Plant Health Inspection Service, 2003.
Warning: These citations may not always be 100% accurate.