Usambara eagle-owl (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Usambara eagle-owl" in English language version.

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birdlife.org

Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2018. The eBird/Clements checklist of birds of the world: v2018. Downloaded August 14, 2018 from http://www.birds.cornell.edu/clementschecklist/download/

"Usambara Eagle-owl (Bubo vosseleri)". Handbook of the Birds of the World Alive. Lynx Edicions. Retrieved 29 October 2016.

Gill, F.; Donsker, D. (June 25, 2018). "IOC World Bird List (v 8.2)". Retrieved June 29, 2018.