Johnston, John B, G. Baley Price, and Fred S. Van Vleck. Mengen, Funktionen, und Wahscheinlichkeit, Band 1: Mengen and Funktionen, Munich : R. Oldenbourg Verlag, 1974. Personal papers of G. Baley Price, PP 523. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/127545 Accessed January 12, 2025.