Haring, C.M. and Ralph M. Bell. "The intradermal test for tuberculosis in cattle and hogs." College of Agriculture Agricultural Experiment Station, Berkeley, California, Bulletin No. 23, March 1914.

Haring, C.M. and Ralph M. Bell. "The intradermal test for tuberculosis in cattle and hogs." College of Agriculture Agricultural Experiment Station, Berkeley, California, Bulletin No. 23, March 1914., 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/262713 Accessed December 24, 2025.