Adolf Wölfli

Left: St. Adolf-Wheel-Hell-Rage. 1917. Pencil and colored pencil on paper. Museum Charlotte Zander.

Right: The Beatenberg, =St. Adolf=Sweetheart=Flag. 1918. Mixed media and collage on paper. Museum Charlotte Zander.

Groundwaters: A Century of Art by Self-Taught and Outsider Artists

By Charles Russell. Prestel, 2011. 256 pages. Hardcover: $25.00

Kunst und Wahn

Kunstforum Wien/DuMont Buchverlag (exhibition catalogue), 1997. Text in German. Illustrated. 454 pages. Limited availability.

Softcover: $125.00