Carta, KU# 4962, A Programmatic Approach for Comparing Effectiveness of Early Childhood Language Program Features, March 25, 1991, Box: 10, Folder: 9. 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/452440 Accessed July 12, 2025.