Schmölders, W. (2012). Ludwig Schaffrath. Glashaus.
Cita Chicago (17th ed.)Schmölders, Wolfgang. "Ludwig Schaffrath." Glashaus 2012.
Cita MLA (8th ed.)Schmölders, Wolfgang. "Ludwig Schaffrath." Glashaus, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.