APA (7th ed.) Citation

Helbich, W. J. (1971). Franklin D. Roosevelt. Colloquium Verl.

Chicago Style (17th ed.) Citation

Helbich, Wolfgang J. Franklin D. Roosevelt. Berlin: Colloquium Verl, 1971.

MLA (8th ed.) Citation

Helbich, Wolfgang J. Franklin D. Roosevelt. Colloquium Verl, 1971.