1. A Study of Washington Weeds;Alvord,1918
2. The British Columbia Directory, 1882–1883;Anderson,1882
3. A Brief Account of the Province of British Columbia, its Climate and Resources;Anderson,1882
4. An Illustrated History of Whitman County, 1901. Walt Lever, 469 pp.
5. The evolution of weeds;Baker;Annu. Rev. Ecol. Syst.,1974