Dixon, Lois, Conditional Stimulus Control over Choice Responding, HD-11194, Grant Awards, 1977 - 1979, Box: 25, Folder: 19. 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/452928 Accessed July 16, 2025.