APA (7th ed.) Citation

Voigt, P., & Klawitter, F. (1924). Ex-Libris. Fritz. Klawitter.

Chicago Style (17th ed.) Citation

Voigt, Paul, and Fritz Klawitter. Ex-Libris. Fritz. Klawitter. [Miejsce nieznane], 1924.

MLA (9th ed.) Citation

Voigt, Paul, and Fritz Klawitter. Ex-Libris. Fritz. Klawitter. 1924.

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