Obrist, H., & Metzger, G. (2008). Gustav Metzger. König.
Cita Chicago (17th ed.)Obrist, Hans-Ulrich, i Gustav Metzger. Gustav Metzger. Köln: König, 2008.
Cita MLA (8th ed.)Obrist, Hans-Ulrich, i Gustav Metzger. Gustav Metzger. König, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.