APA (7th ed.) Citation

Thunhorst, G., & Swearingen, J. M. (2005). Canada thistle. Plant Conservation Alliance, Alien Plant Working Group.

Chicago Style (17th ed.) Citation

Thunhorst, Gwendolynl, and Jil M. Swearingen. Canada Thistle. [Washington, D.C.]: Plant Conservation Alliance, Alien Plant Working Group, 2005.

MLA (9th ed.) Citation

Thunhorst, Gwendolynl, and Jil M. Swearingen. Canada Thistle. Plant Conservation Alliance, Alien Plant Working Group, 2005.