O'Brien, Marion, Parental Attributions and Children's Social Cognitive Development, KU# 1370X, Correspondence, 1997, Box: 54, Folder: 5. 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/455195 Accessed July 09, 2025.