Risley, Todd, Experimental Recreation in an Urban Poverty Area, MH 19934-01, March, 1971, Box: 68, 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/455617 Accessed May 17, 2025.