APA (7th ed.) Citation

Koppisch, O., & Geyer, A. (1906). Ex Libris Alfred Geyer.

Chicago Style (17th ed.) Citation

Koppisch, Oskar, and Alfred Geyer. Ex Libris Alfred Geyer. [S. l, 1906.

MLA (9th ed.) Citation

Koppisch, Oskar, and Alfred Geyer. Ex Libris Alfred Geyer. 1906.

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