"Visitors Are Favored To Win". The Cincinnati Enquirer. November 18, 1939 – via Newspapers.com.("Jack Mattiford, 190-pound junior letterman, will start at a wing spot, although he held an assignment in the backfield quartet as a sophomore.")
"Line Not As Good As Backfield". Dayton Daily News. October 19, 1939 – via Newspapers.com.("Jack Mattiford, a junior who played tackle last season . . . will be at the other wing . . .")