Spencer, John. All Change Under the Betts Blueprint. Sheffield, England: Frontiers, The Employment, 1987., January 13, 1988

Spencer, John. All Change Under the Betts Blueprint. Sheffield, England: Frontiers, The Employment, 1987., January 13, 1988, Box: 2, Folder: 18. Robert Kraushaar papers, 6754. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/542670 Accessed May 10, 2025.