Milwaukee Art Institute, Catalogue of June Exhibitions, 1918.
No author noted, "Artist Alten Does Not Go Far to Find Charm
No author noted, Exhibition catalogue, The Durant Hotel, Flint, Michigan, April twenty-first to twenty-eighth, 1928? "American and Spanish Paintings by Mathias J. Alten," .
Patricia Reed, Archivist/President of the Scarab Club, 2006, and Michael Crane, Assistant Curator of American Art, Detroit Institute of Arts, Compilers, "Exhibition Records, the Detroit Museum of Art and the Detroit Institute of Arts," .
No author noted, Exhibition Catalogue of Paintings by Mathias J. Alten - November 12, 1926, "Exhibition Catalogue, The Lansing Woman's Club".
No author noted, "Artist Wins National Fame With His Nature Studies around Grand Rapids," Grand Rapids Herald, January 14, 1917.