Mordt, Anders L. Oslo Posten. (Guymon, Okla.), Vol. 1, No. 9, Ed. 1 Friday, October 21, 1910, newspaper, October 21, 1910; (https://texashistory.unt.edu/ark:/67531/metapth636078/m1/1/: accessed May 26, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .