Kort til Balduin Möllhausen's Rejse fra Mississippi til Sydhavets Kyster i Aarene 1853 1854., map, 1858; (https://texashistory.unt.edu/ark:/67531/metapth190401/m1/1/: accessed June 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .