Graham, J.R. and H.G. Wolf. "The emchanism of migraine headache and action of ergotamine tartrate. Gynergen Abstract Series No. 4, Sandoz Chemical Works, 1938.

Graham, J.R. and H.G. Wolf. "The emchanism of migraine headache and action of ergotamine tartrate. Gynergen Abstract Series No. 4, Sandoz Chemical Works, 1938., 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/262658 Accessed December 24, 2025.