Higuchi et. al, "Behavior of Acid-Base Indicators in Acetic Acid System,", 1956

Higuchi et. al, "Behavior of Acid-Base Indicators in Acetic Acid System,", 1956, Box: 10, Folder: 48. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124472 Accessed December 25, 2025.