Barton, Benjamin Smith (1799). Fragment of the natural history of Pennsylvania.: 11
Barrowclough, G. F., Groth, J. G., Odom, K. J., & Lai, J. E. (2011). Phylogeography of the Barred Owl (Strix varia): species limits, multiple refugia, and range expansion. Auk128: 696‐706 [concludes species is monotypic, except for split of S. sartorii in Mexico].