APA (7th ed.) Citation

Bovard, F., & Bertschi, O. (1947). Ex-Libris Otto Bertschi.

Chicago Style (17th ed.) Citation

Bovard, Fortuné, and Otto Bertschi. Ex-Libris Otto Bertschi. 1947.

MLA (9th ed.) Citation

Bovard, Fortuné, and Otto Bertschi. Ex-Libris Otto Bertschi. 1947.

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