Willman, John P, S.A. Asdell and Peter Olafson. "An investigation of the cause of the stiff-lamb disease." Cornell University Agricultural Experiment Station Bulletin, No 603, May 1934.

Willman, John P, S.A. Asdell and Peter Olafson. "An investigation of the cause of the stiff-lamb disease." Cornell University Agricultural Experiment Station Bulletin, No 603, May 1934., Box: 5. Veterinary Reprint and Pamphlet Collection, 24-4-3369. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/263356 Accessed December 27, 2025.