Gammel, Hans Peter Mareus Neilsen. The Laws of Texas, 1937-1939 [Volume 31], Book, 1939; digital images, (http://texashistory.unt.edu/ark:/67531/metapth18824/ : accessed May 25, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting UNT Libraries, Denton, Texas.
