LUDWIG v. MASSACHUSETTS. The Oyez Project at IIT Chicago-Kent College of Law. 13 February 2012. <http://www.oyez.org/cases/1970-1979/1975/1975_75_377>.
LUDWIG v. MASSACHUSETTS, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/1970-1979/1975/1975_75_377 (last visited February 13, 2012).
"LUDWIG v. MASSACHUSETTS," The Oyez Project at IIT Chicago-Kent College of Law, accessed February 13, 2012, http://www.oyez.org/cases/1970-1979/1975/1975_75_377.