"The Spirit of the Times in Childhood Education" by Milton J.E. Senn, M.D., 1968 April 3, id21468, Box: 3, Folder: 19. Southern California Association for the Education of Young Children Collection, URB-SCAEYC. Special Collections & Archives. https://findingaids.csun.edu/repositories/2/archival_objects/41041 Accessed June 05, 2026.