Reichard, C. G. (Christian Gottlieb), 1758-1837. Charte von Nordamerica : nach den neuesten Bestimmungen und Entdeckungen., map, 1802; (https://texashistory.unt.edu/ark:/67531/metapth298266/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .