Heimstätten für das Volk: Vorlesung über Texas, book, 1883; (https://texashistory.unt.edu/ark:/67531/metapth28590/m1/1/: accessed May 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Heimstätten für das Volk: Vorlesung über Texas, book, 1883; (https://texashistory.unt.edu/ark:/67531/metapth28590/m1/1/: accessed May 7, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .