APA (7th ed.) Citation

Helfferich, K. (1919). Der Weltkrieg. Ullstein & Co.

Chicago Style (17th ed.) Citation

Helfferich, Karl. Der Weltkrieg. Berlin: Ullstein & Co, 1919.

MLA (8th ed.) Citation

Helfferich, Karl. Der Weltkrieg. Ullstein & Co, 1919.

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