Project MORE, Phoneme Boundary, Th with /t/,/f/, /d/, and /s/, Raymore/Mclean, Box: 59, Folder: 10. University of Kansas Schiefelbusch Institute for Life Span Studies records, RG 35. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/455369 Accessed June 02, 2024.