Bakker, T. H. (2021). Stephan Keppel: Hard Copies. Camera Austria.
Cita Chicago (17th ed.)Bakker, Taco Hidde. "Stephan Keppel: Hard Copies." Camera Austria 2021.
Cita MLA (8th ed.)Bakker, Taco Hidde. "Stephan Keppel: Hard Copies." Camera Austria, 2021.
Atenció: Aquestes cites poden no estar 100% correctes.