APA (7th ed.) Citation

Widmer, K. (1902). Hermann Billing - Karlsruhe.

Chicago Style (17th ed.) Citation

Widmer, Karl. Hermann Billing - Karlsruhe. 1902.

MLA (9th ed.) Citation

Widmer, Karl. Hermann Billing - Karlsruhe. 1902.

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