APA (7th ed.) Citation

Erkens, P. (1917). Verdun. s.t.

Chicago Style (17th ed.) Citation

Erkens, Paul. Verdun. [München]: s.t, 1917.

MLA (9th ed.) Citation

Erkens, Paul. Verdun. s.t, 1917.

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