The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

• American Ornithologists’ Union. 1998. Check-list of North American Birds, 7th edition. American Ornithologists’ Union, Washington, D.C.
• Baetsen, R. 2000. "Great Gray Owl (Strix nebulosa)" (On-line). Accessed 12 Aug. 2000 at http://www.northbirding.com/rbaetsen/greatgray.htm.
• Banks, R. C., R. W. McDiarmid, A. L. Gardner, and W. C. Starnes. 2003. Checklist of Vertebrates of the United States, the U.S. Territories, and Canada
• Banks, R. C., R. W. McDiarmid, and A. L. Gardner. 1987. Checklist of Vertebrates of the United States, the U.S. Territories, and Canada. Resource Publication, no. 166. 79
• BirdLife International 2009. Strix nebulosa
• Comptons Encyclopedia, 1998. "BIRDS OF PREY" (On-line). Accessed 11 Aug. 2000 at http://www.comptons.com/encyclopedia/ARTICLES/0000/00229376_A.html#P21.
• Dunne, P. 2006. Pete Dunne’s Essential Field Guide Companion. Houghton Mifflin, Boston.
• EURING list of longevity records for European birds (Online source)
• Gill, Frank, and Minturn Wright. 2006. Birds of the World: Recommended English Names. ix + 259
• Holt, D.W., R. Berkley, C. Deppe, P.L.Enríquez Rocha, J.L. Petersen, J.L. Rangel Salazar, K.P. Segars, and K.L. Wood. 1999. Great Grey Owl. Pp. 203-204 in: del Hoyo, J., A. Elliott, and J. Sargatal, eds. Handbook of the Birds of the World. Vol. 5. Barn-owls to Hummingbirds. Lynx Edicions, Barcelona.
• Huff, M., J. Henshaw, E. Laws. 1997. "Great Gray Owl survey status and evaluation of guidelines for the Northwest Forest Plan" (On-line). Accessed 12 Aug. 2000 at http://www.or.blm.gov/surveyandmanage/SP/Great%20Gray%20Owl/icover.htm.
• Idaho Conservation Data Center, 2001. "Rare Birds" (On-line). Accessed 8 March 2001 at http://www2.state.id.us/fishgame/Info/CDC/bird.htm.
• Kaufman, K. 1996. Lives of North American Birds. Houghton Mifflin, Boston.
• MacBride Raptor Project, 1997. "Great Gray Owl" (On-line). Accessed 6 Aug. 2000 at http://www.ai-design.com/stargig/raptor/global/content/report/GreatGrayOwl.html.
• Mann, M. "THE GREAT GRAY OWL - BIRD BIOGRAPHIES" (On-line). Accessed 12 Aug. 2000 at http://www.sicamous.com/bluheron/Gowl_bio.html.
• Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 16, 2011 at http://animaldiversity.org. http://www.animaldiversity.org
• Osborne, T. 07/24/2000. "Great Gray Owl" (On-line). Accessed 5 Aug. 2000 at http://www.state.ak.us/local/akpages/FISH.GAME/notebook/bird/grayowl.htm.
• Svensson, L. 2009. Birds of Europe, 2nd edition. Princeton University Press, Princeton, New Jersey.
• The Owl Pages, "Great Gray Owls - Strix nebulosa" (On-line). Accessed 12 Aug. 2000 at http://owlpages.com/species/greatgrey/.
• The Raptor Center, "RAPTOR FACTS" (On-line). Accessed 9 Aug. 2000 at http://www.raptor.cvm.umn.edu/raptor/rfacts/ggo.html.
• UNEP World Conservation Monitoring Center, 2001. "Threatened and Endangered Species: Strix nebulosa" (On-line). Accessed 8 March 2001 at http://www.unep-wcmc.org/index.html?http://ims.wcmc.org.uk/isdb/Taxonomy/tax-species-result.cfm?Genus=Strix&Species=nebulosa~main.
• Wolf, L. 16-May-2000. "Hunters of the Sky" (On-line). Accessed 12 Aug. 2000 at http://www.acnatsci.org/raptors/owl.html.