APA (7th ed.) Citation

Kunst, A., & Drobner, G. (1911). Ex Libris Gustav Drobner.

Chicago Style (17th ed.) Citation

Kunst, Adolf, and Gustav Drobner. Ex Libris Gustav Drobner. [S. l, 1911.

MLA (9th ed.) Citation

Kunst, Adolf, and Gustav Drobner. Ex Libris Gustav Drobner. 1911.

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