APA (7th ed.) Citation

Krahl, E. A., & Ammann, A. F. (1890). Ex-Libris August F. Ammann.

Chicago Style (17th ed.) Citation

Krahl, Ernst August, and August Ferdinand Ammann. Ex-Libris August F. Ammann. [S. l, 1890.

MLA (9th ed.) Citation

Krahl, Ernst August, and August Ferdinand Ammann. Ex-Libris August F. Ammann. 1890.

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