Hadwen, Seymour. "Warble flies: the economic aspect and a contribution on the biology." Department of Agriculture, Canada, Health of Animals Branch, Bulletin No.16, November 1912.

Hadwen, Seymour. "Warble flies: the economic aspect and a contribution on the biology." Department of Agriculture, Canada, Health of Animals Branch, Bulletin No.16, November 1912., Box: 2. Veterinary Reprint and Pamphlet Collection, 24-4-3369. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/262706 Accessed December 26, 2025.