Preface, H.R. Turnbull and A. Turnbull in Family-Centered Care: An Approach to Implementation, Hostler, 1994, Box: 1, Folder: 16. Personal papers of Rud Turnbull, PP 511. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/304769 Accessed June 15, 2025.