APA (7th ed.) Citation

(1921). Text on the back: "Der von der Polizei in Berlin ermordete "Kommunist" Sylt.

Chicago Style (17th ed.) Citation

Text on the Back: "Der Von Der Polizei in Berlin Ermordete "Kommunist" Sylt. 1921.

MLA (8th ed.) Citation

Text on the Back: "Der Von Der Polizei in Berlin Ermordete "Kommunist" Sylt. 1921.

Warning: These citations may not always be 100% accurate.