Spieth, D. A. (2011). All that happened had to happen: Walter Bortolossi / Text by Darius A. Spieth ; published by Louisiana State University School of Art. Louisiana State University Press.

Spieth, Darius A. All That Happened Had to Happen: Walter Bortolossi / Text by Darius A. Spieth ; Published by Louisiana State University School of Art. Baton Rouge: Louisiana State University Press, 2011.

Spieth, Darius A. All That Happened Had to Happen: Walter Bortolossi / Text by Darius A. Spieth ; Published by Louisiana State University School of Art. Louisiana State University Press, 2011.