Ives, Ronald L. 1941. The Origin of the Sonora townsite, Sonora, Mexico, American Antiquity, Vol. 7, pp. 20-28

Ives, Ronald L. 1941. The Origin of the Sonora townsite, Sonora, Mexico, American Antiquity, Vol. 7, pp. 20-28, Box: 8, Folder: 30. Campbell W. Pennington Papers, 33036864. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/279305 Accessed September 26, 2026.