Links, Inc. San Antonio Chapter. [Letter from G. W. Mervin to Anna Harris - May 10, 1963], letter, May 10, 1963; (https://texashistory.unt.edu/ark:/67531/metapth305764/m1/1/: accessed October 15, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .