Curl, John. History of Work Cooperation in America. Berkeley: Homeward Press, 1980

Curl, John. History of Work Cooperation in America. Berkeley: Homeward Press, 1980, Box: 3, Volume: 14. Midwest Distributors records, RH MS 949. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/573990 Accessed January 02, 2026.