Bossard, C.C., J.M. Randall, and M.C. Hoshovsky. 2000. Invasive Plants of California’s Wildlands, University of California Press.
DiTomaso, J.M., and E.A. Healy. 2003. Aquatic and Riparian Weeds of the West, University of California Publication 3421.
DiTomaso, J.M., and E.A. Healy. 2007. Weeds of California and Other Western States, University of California Publication 3488.
Harper-Lore, B.L., and M. Wilson. 1999. Roadside Use of Native Plants, Island Press, Washington, D.C.
Harris, J.G., and M.W. Harris. 1994. Plant Identification Terminology, Spring Lake Publishing.
Royer, F. and R. Dickinson. 1999. Weeds of the Northern U.S. and Canada, University of Alberta Press.
Sheley, R.L., and J.K. Petroff, eds. 1999. Biology and Management of Noxious Rangeland Weeds, Oregon State University Press.
Stubbendieck, J., S.L. Hatch and C.H. Butterfield. 1997. North American Range Plants, University of Nebraska Press.
Taylor, R.J., 1990. Northwest Weeds, Mountain Press Publishing Co.
Whitson, T., ed. 2009 (10th Edition). Weeds of the West, University of Wyoming.
William, R.D., et al. 2003. PNW Weed Management Handbook, Oregon State University.