Carta, KU# 4962, A Programmatic Approach for Comparing Effectiveness of Early Childhood Language Program Features, January 8, 1990, Box: 10, Folder: 7. 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/452438 Accessed May 16, 2025.