"The Albeertus Darnell Collection"(PDF). Walter P. Reuther Library, Archives of Labor and Urban Affairs. Wayne State University. p. 1. Retrieved 23 March 2016.
cwesterman (November 4, 2008). "David Mackenzie Papers". Walter P. Reuther Library, Archives of Labor and Urban Affairs. Wayne State University. Retrieved 23 March 2016.