Cita APA (7th ed.)

Wichmann, S., & Spitzweg, C. (2002). Carl Spitzweg: Siegfried Wichmann. Belser.

Cita Chicago (17th ed.)

Wichmann, Siegfried, i Carl Spitzweg. Carl Spitzweg: Siegfried Wichmann. Stuttgart: Belser, 2002.

Cita MLA (8th ed.)

Wichmann, Siegfried, i Carl Spitzweg. Carl Spitzweg: Siegfried Wichmann. Belser, 2002.