"The Geographical Distribution of the Short-Eared Owl (Asio accipitrinus). By R. Bowdler Sharpe, F.L.S, F.Z.S. Accipetres, from G. R. Gray’s Genera of Birds, MS G40. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/231583 Accessed May 13, 2024.