June 28, 1968, Congressional Record- Senate: "Voting Age- Message from the President"June 28, 1968Johnson, Lyndon B. (Lyndon Baines), 1908-1973https://creativecommons.org/publicdomain/mark/1.0/enghttp://congressarchives.org/record/EMD_Working_Papers-f366-1968_06_28Message From President Johnson About The Lowering Of The Voting Age And His Proposal For The Amendment To Be Added To The Constitution.