MLA

Aldrich-Markham, Susan, et al. The Speedwells : Veronica Hederaefolia L., Veronica Persica Poir., Veronica Filiformis Sm., Veronica Peregrina L. : [Corvallis, Or.] : Oregon State University Extension Service ; [Pullman, Wash.] : Washington State University Cooperative Extension ; [Moscow, Idaho] : University of Idaho Cooperative Extension System ; [Washington, D.C.] : U.S. Dept. of Agriculture, 1995.