[Rockefeller's Event Calendar: April 1988], pamphlet, March 1988; (https://texashistory.unt.edu/ark:/67531/metapth1544942/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
[Rockefeller's Event Calendar: April 1988], pamphlet, March 1988; (https://texashistory.unt.edu/ark:/67531/metapth1544942/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .