Flexner, Simon and Hideyo Noguchi. "On the plurality of cytolysins in normal blood serum." Reprinted from the University of Pennsylvania Medical Bulletin, July-August 1903.

Flexner, Simon and Hideyo Noguchi. "On the plurality of cytolysins in normal blood serum." Reprinted from the University of Pennsylvania Medical Bulletin, July-August 1903., 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/262571 Accessed December 21, 2025.