Peterson, R. T., & DiGiorgio, M. (2010). Peterson field guide to birds of Western North America (4th ed.). Houghton Mifflin Harcourt.
Cita Chicago Style (17a ed.)Peterson, Roger Tory, y Michael DiGiorgio. Peterson Field Guide to Birds of Western North America. 4th ed. Boston [Mass.]: Houghton Mifflin Harcourt, 2010.
Cita MLA (8a ed.)Peterson, Roger Tory, y Michael DiGiorgio. Peterson Field Guide to Birds of Western North America. 4th ed. Houghton Mifflin Harcourt, 2010.
Precaución: Estas citas no son 100% exactas.