Kessler, H. L., & Wolf, G. (1998). The Holy Face and the paradox of representation: Papers from a colloquium held at the Bibliotheca Hertziana, Rome and the Villa Spelman, Florence, 1996 / Ed. with an Introd. by Herbert L. Kessler and Gerhard Wolf. Nuova Alfa Ed..

Kessler, Herbert L., and Gerhard Wolf. The Holy Face and the Paradox of Representation: Papers from a Colloquium Held at the Bibliotheca Hertziana, Rome and the Villa Spelman, Florence, 1996 / Ed. with an Introd. by Herbert L. Kessler and Gerhard Wolf. Bologna: Nuova Alfa Ed., 1998.

Kessler, Herbert L., and Gerhard Wolf. The Holy Face and the Paradox of Representation: Papers from a Colloquium Held at the Bibliotheca Hertziana, Rome and the Villa Spelman, Florence, 1996 / Ed. with an Introd. by Herbert L. Kessler and Gerhard Wolf. Nuova Alfa Ed., 1998.