Jones, Myrle; Jones, Margaret (1945). "The Third Annual Iowa Spring Bird Census"(PDF). Iowa Bird Life. 15 (3). Winthrop, Iowa: Iowa Ornithologist's Union: 42–49. Archived from the original(PDF) on June 25, 2008. Retrieved January 21, 2008.
Jones, Myrle; Jones, Margaret (1945). "The Third Annual Iowa Spring Bird Census"(PDF). Iowa Bird Life. 15 (3). Winthrop, Iowa: Iowa Ornithologist's Union: 42–49. Archived from the original(PDF) on June 25, 2008. Retrieved January 21, 2008.