Schmieder, E. (1960). Carl Bolle: Eberhard Schmieder.
Cita Chicago (17th ed.)Schmieder, Eberhard. Carl Bolle: Eberhard Schmieder. [s.l.], 1960.
Cita MLA (8th ed.)Schmieder, Eberhard. Carl Bolle: Eberhard Schmieder. 1960.
Atenció: Aquestes cites poden no estar 100% correctes.