McFarland, Joseph and Edward M. L'Engle. "Observations upon the phagocytic power of the blood of supposedly normal human beings." Reprinted from Medicine, April 1906., Box: 3. Veterinary Reprint and Pamphlet Collection, 24-4-3369. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/262858 Accessed April 08, 2026.