Messler, N. Peter Zimmermann. Kunst in Köln.
Cita Chicago (17th ed.)Messler, Norbert. "Peter Zimmermann." Kunst in Köln .
Cita MLA (8th ed.)Messler, Norbert. "Peter Zimmermann." Kunst in Köln, .
Atenció: Aquestes cites poden no estar 100% correctes.