Colombo, John, #4401-0706-1, Individual Differences in Early Visual Behavior, April 3, 1985, Box: 12, Folder: 23. 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/452533 Accessed July 13, 2025.