Herbstreuth, P. (1998). Hans Kollhoff & Gerhard Merz. Flash Art.
Lua i Stíl Chicago (17ú heag.)Herbstreuth, Peter. "Hans Kollhoff & Gerhard Merz." Flash Art 1998.
Lua MLA (8ú heag.)Herbstreuth, Peter. "Hans Kollhoff & Gerhard Merz." Flash Art, 1998.
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