Constant Duméril, Traité élémentaire d'histoire naturelle, vol. 2, t. II, (lire en ligne), chap. XVIII (« Des oiseaux, ou de la troisième classe du règne animal »)
usgs.gov
alaska.usgs.gov
Van Hemert, C. 2007. Alaskan birds at Risk: Widespread beak deformities in resident species. American Birding. 39(5):48-55. (Article, 977kb PDF)
Van Hemert, C., and C. M. Handel. 2010. Beak deformities in Northwestern Crows: Evidence of a multispecies epizootic. Auk 127(4):746-751. (Article 976kb PDF) Online Supplement. (134kb PDF)
Handel, C. M., L. M. Pajot, S. M. Matsuoka, K. A. Trust, J. M. Stotts, J. Terenzi, and S. L. Talbot. 2006. Potential Role of Environmental Contaminants in the Pathology of Beak Deformities among Black-capped Chickadees in South-central Alaska. Unpublished final report. Project ID: 1130-7F22. U. S. Geological Survey, Alaska Science Center, Anchorage, Alaska. PDF - 15 MB