1997. A field guide to the warblers of North America. Houghton Mifflin. Boston. MA. Dunning, J. B., Jr. 1993. ... The natural history of the Long expedition to the Rocky Mountains 1819-1820. ... Ford, R., Z. Ma, S. Barsness. and R. Redmond.
|Title||:||Research and management of the brown-headed cowbird in Western landscapes|
|Author||:||Partners in Flight. Research Working Group, United States. Bureau of Land Management, California State University, Sacramento, Cooper Ornithological Society|