Plants Causing Sudden Death - A. P. Knight and R. G. Walter In: A Guide to Plant Poisoning of Animals in North America, Knight A.P. and Walter R.G. (Eds.) Ithaca: International Veterinary Information Service (www.ivis.org), 2002; B0501.0101
Guide to Poisonous Plants - Searchable database from the College of Veterinary Medicine and Biomedical Sciences.