Hoffmann, G., & Hornung, A. Preface: Gerhard Hoffmann. Alfred Hornung. Ethics and aesthetics : the moral turn of postmodernism.(1996).
Lua i Stíl Chicago (17ú heag.)Hoffmann, Gerhard, agus Alfred Hornung. "Preface: Gerhard Hoffmann. Alfred Hornung." Ethics and Aesthetics : The Moral Turn of Postmodernism.(1996) .
Lua MLA (8ú heag.)Hoffmann, Gerhard, agus Alfred Hornung. "Preface: Gerhard Hoffmann. Alfred Hornung." Ethics and Aesthetics : The Moral Turn of Postmodernism.(1996), .
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