Porsche Club of America. Maverick Region. Slipstream, Volume 46, Issue 3, March 2008, periodical, March 2008; (https://texashistory.unt.edu/ark:/67531/metapth848907/m1/1/: accessed November 19, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .