Wiens, David; Anthony, Robert; Forsman, Eric (April 2011). "Barred owl occupancy surveys within the range of the northern spotted owl". The Journal of Wildlife Management. 75 (3): 531–538. doi:10.1002/jwmg.82. S2CID54592663.
Kurochkin, E.N.; Dyke, G.J. (2011). "The first fossil owls (Aves: Strigiformes) from the Paleogene of Asia and a review of the fossil record of Strigiformes". Paleontological Journal. 4 (45): 445–458. doi:10.1134/s003103011104006x. S2CID84397725.
Wiens, David; Anthony, Robert; Forsman, Eric (April 2011). "Barred owl occupancy surveys within the range of the northern spotted owl". The Journal of Wildlife Management. 75 (3): 531–538. doi:10.1002/jwmg.82. S2CID54592663.
Kurochkin, E.N.; Dyke, G.J. (2011). "The first fossil owls (Aves: Strigiformes) from the Paleogene of Asia and a review of the fossil record of Strigiformes". Paleontological Journal. 4 (45): 445–458. doi:10.1134/s003103011104006x. S2CID84397725.
Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (January 2023). "Owls". IOC World Bird List Version 13.1. International Ornithologists' Union. Retrieved 31 January 2022.