Thompson, Edward Randall, Jr. & Kempner, Harris Leon, Jr. [Letter from E. R. Thompson, Jr. and H. L. Kempner, Jr. to H. Kempner and A. Alpert, April 7, 1964], letter, April 7, 1964; (https://texashistory.unt.edu/ark:/67531/metapth1198511/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .