Ullrich, Wolfgang, Harald Falckenberg, and Martin Prinzhorn. MARKUS OEHLEN. 212 pages, illustrated throughout in color and b&w. 4to, cloth. Cologne, Walther Koenig, 2008.
Edited by Galerie Barbel Grasslin, Frankfurt, and Galerie Hans Mayer, Dusseldorf. Text in English and German.