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Milleson, Michael P.; Stephanie P. Shwiff; Michael L. Avery (2006). "Vulture-Cattle Interactions – A Survey of Florida Ranchers"(PDF). Proceedings, 22nd Vertebrate Pest Conference. University of California, Davis. Archived from the original(PDF) on December 10, 2015. Retrieved December 9, 2007.
Paulik, Laurie (August 6, 2007). "Vultures and Livestock". AgNIC Wildlife Damage Management Web. Archived from the original on August 8, 2007. Retrieved October 15, 2007.
Milleson, Michael P.; Stephanie P. Shwiff; Michael L. Avery (2006). "Vulture-Cattle Interactions – A Survey of Florida Ranchers"(PDF). Proceedings, 22nd Vertebrate Pest Conference. University of California, Davis. Archived from the original(PDF) on December 10, 2015. Retrieved December 9, 2007.
Paulik, Laurie (August 6, 2007). "Vultures". AgNIC Wildlife Damage Management Web. Archived from the original on August 10, 2007. Retrieved October 15, 2007.