Internet consulté le 28-03-2005, http://www.tsha.utexas.edu/handbook/online/articles/view/SS/fso15.html
Information trouvée : SONNICHSEN, CHARLES LELAND (1901-1991). Charles Leland Sonnichsen, Southwestern historian,
folklorist, writer, editor, and teacher, son of Henry Matthew and Mary (Hults) Sonnichsen,
was born in Fonda, Iowa, on September 20, 1901. Sonnichsen died on June 29, 1991