MINE WORKERS v. PENNINGTON. The Oyez Project at IIT Chicago-Kent College of Law. 12 February 2012. <http://www.oyez.org/cases/1960-1969/1964/1964_48>.
MINE WORKERS v. PENNINGTON, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1960-1969/1964/1964_48 (last visited February 12, 2012).
"MINE WORKERS v. PENNINGTON," The Oyez Project at IIT Chicago-Kent College of Law, accessed February 12, 2012, http://www.oyez.org/cases/1960-1969/1964/1964_48.