לילית אפורה
לקריאה נוספת

"Ageing and Variation of Great Gray Owls", Ontario Field Ornithologists.
C. Van Riper III and J. Van Wagtendonk (2006) "Home Range Characteristics of Great Gray Owls in Yosemite National Park, California", Journal of Raptor Research, 40(2), 130-141.
C.L. Sears (2006), "Assessing Distribution, Habitat Suitability, and Site Occupancy of Great Gray Owls (Strix nebulosa) in California", M.S. Thesis, University of California, Davis.
G.D. Hayward and J. Verner, Eds (1994), "Flammulated, Boreal and Great Gray Owls in the United States: A technical conservation assessment", USDA Forest Service General Technical Report RM-253. Fort Collins, CO.
Heimo Mikkola, Risto Tornberg and David E. Willard (Dec 2013), "Sex-related dietary differences in Great Gray Owls in Finland and the USA", Ontario Birds 31(3):160-171.
Ian Newton, "Ecology and Conservation of Owls", Csiro Publishing, 2002. ISBN 9780643067943.
J. Latham (1790), Strix barbata, Index Ornithologicus 1:62.
J.F. Gmelin (1788), Strix cinerea, Systema Naturae, pt 1:291.
J. M. Hull et al (2008), Development of 37 microsatellite loci for the great gray owl (Strix nebulosa) and other Strix spp. owls., Conservation genetics, 9(5), 1357-1361.
James R. Duncan (1997), "Great Gray Owls (Strix nebulosa nebulosa) and forest management in North America: a review and recommendations.", Journal of Raptor Research 31: 160-166.
James R. Duncan, "Owls of the World: Their Lives, Behavior and Survival", Firefly Books, 2003. ISBN 9781552978450.
Johann Reinhold Forster (1772), "An Account of the Birds Sent from Hudson's Bay; With Observations Relative to Their Natural History; And Latin Descriptions of Some of the Most Uncommon. By JR Forster, FRS.", Philosophical Transactions 62: 382-433.
J.J. Keene, H.B. Ernest and J.M. Hull (2011), "Conservation and Management of the Great Gray Owl 2007-2009: Assessment of Multiple Stressors and Ecological Limiting Factors", Final Report, Interagency Acquisition Agreement Number F8813-07-0611, National Park Service, Yosemite National Park and USDA Forest Service, Pacific Southwest Research. April 2011.
Karel Hendrik Voous and Ad Cameron, "Owls of the northern hemisphere", MIT Press, 1989. ISBN 9780262220354.
Pentti Alaja and Heimo Mikkola, "Albinism in the Great Gray Owl (Strix nebulosa) and other owls", United States Department of Agriculture Forest Forest Service General Technical Report NC (1997): 33-37.
Robert W. Nero, "Great Gray Owl: Phantom of the Northern Forest", Smithsonian Institution Press, 1987. ISBN 9780874746730.
Robert W. Nero, "Lady Grayl: Owl with a Mission", Dundurn, 1994. ISBN 9780920474945
Allan P. Sandilands, "Birds of Ontario: Habitat Requirements, Limiting Factors, and Status", Volume 2, p. 217–218, UBC Press, 2010. ISBN 9780774843744.
Claus König, Friedhelm Weick and Jan-Hendrik Becking, "Owls of the World" (2nd ed.), p. 382–384, Bloomsbury Publishing, 2009. ISBN 9781408108840.
"Cutting for Wildlife - Forest Harvest and the Great Gray Owl", Nature North.
Donald S. Heintzelman, "Hawks and Owls of Eastern North America", p. 151, Rutgers University Press, 2004. ISBN 9780813533506.
E. L. Bull and M. G. Henjum (1990), "Ecology of the great gray owl", General technical report/United States Department of Agriculture, Pacific Northwest Research Station (PNW-GTR-265).
Floyd Scholz and Tad Merrick, "Owls", p. 308, 327;Stackpole Books, 2001. ISBN 9780811710213.
"Great Grey Owl (Strix nebulosa)", The Owl Foundation.
Heimo Mikkola, "Owls of the World: A Photographic Guide" (2nd edition), pp. 20–21, 23, 30–31, 50, 53, 55, 68, 82, 263, 353–356; Firefly Books, 2013. ISBN 9781770852747.
Kim Long, "Owls: A Wildlife Handbook", p. 25, 80, 116 and 120; Big Earth Publishing, 1998 ISBN 9781555662004.
"Manitoba's Provincial Bird Emblem, The Great Gray Owl", Naturenorth.