6 literature references for Bubo virginianus (Oberholser, 1904):

Author: American Ornithologists' Union
Year: 1957
Title:
Source: Check-list of North American Birds, 5th Edition
Author: Weick, Friedholm
Year: 1999
Title: Zur Taxonomie der Amerikanischen Uhus (Bubo spp). Unter Berücksichtigung eines größtenteils parallel variierenden Polymorphismus innerhalb der Subspecies. Mit zwei Farbtafeln und zwei Verbreitungskarten
Source: Ökologie der Vögel, vol. 21, no. 2
Author: Peters, James Lee
Year: 1945
Title:
Source: Check-list of Birds of the World, vol. 5
Author: Dickinson, Edward C., ed.
Year: 2003
Title:
Source: The Howard and Moore Complete Checklist of the Birds of the World, 3rd edition
Author:
Year: 1996
Title:
Source: database, NODC Taxonomic Code
Author:
Year: 2005
Title:
Source: website, Zoonomen - Zoological Nomenclature Resource, 2005.08.07