Gerhard Altenbourg, ... Thomas Ziegler ; catalogue for an exhibition ; [september 16 - november 5, 1989, Busch-Reisinger Museum, Harvard Univ., Cambridge, Mass. ; december 5, 1989 - january 21, 1990, Frederick S. Wight Art Gallery, Univ. of California, Los Angeles ; february 9 - march 25, 1990, Univ. of Michigan Museum of Art, Ann Arbor, Michigan]
Nisbet, Peter (Hrsg.) ; Ashton, Dore ; Busch-Reisinger Museum