Poisonous Plants of California. Fuller, Thomas C. and Elizabeth McClintock, 1986. Berkeley: University of California Press.
Handbook of Poisonous and Injurious Plants, 2nd Ed. Nelson LS, Shih RD and Balick MJ: Springer Science Publishing, 2019.
Sunset Western Garden Book. Sunset Publishing Corporation, 2001.
A Field Guide to Edible Wild Plants of Eastern and Central North America. Peterson, Lee Allen 1977. Houghton Mifflin Company.
Poisonous Plants Second Edition, A Handbook for Doctors, Pharmacists, Toxicologists, Biologists and Veterinarians. Frohne, Dietrich and Hans Jurgen Pfander 2004. Timber Press, Inc.
Websites
University of California Safe and Poisonous Garden Plants https://ucanr.edu/sites/poisonous_safe_plants/
California Poison Control System https://calpoison.org/topics/plant
Biology, Ecology, and Management of Blueweed, Montana State University Extension, November 18, 2019. http://msuextension.org/publications/AgandNaturalResources/EB0195.pdf
