Schulz, Roy F., 1920 -. Papers, 1950 – 1974. SMHC Manuscript Collection 1204, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato.

Schulz, Roy F., 1920 -. Papers, 1950 – 1974. SMHC Manuscript Collection 1204, Southern Minnesota Historical Center, Memorial Library, Minnesota State University, Mankato. https://archivesspace.lib.mnsu.edu/public/repositories/4/resources/178 Accessed January 31, 2025.