Gammel, Hans Peter Mareus Neilsen. The Laws of Texas, 1929-1931 [Volume 27], Book, 1931; digital images, (http://texashistory.unt.edu/ark:/67531/metapth16362/ : accessed May 22, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting UNT Libraries, Denton, Texas.
