APA (7th ed.) Citation

Wenig, B., & Heyl, D. v. (1901). Ex Libris Doris von Heyl.

Chicago Style (17th ed.) Citation

Wenig, Bernhard, and Doris von Heyl. Ex Libris Doris Von Heyl. [S. l.], 1901.

MLA (9th ed.) Citation

Wenig, Bernhard, and Doris von Heyl. Ex Libris Doris Von Heyl. 1901.

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