APA (7th ed.) Citation

Häffcke, F., & Kiewy, H. (1909). Ex Libris Herm. Kiewy.

Chicago Style (17th ed.) Citation

Häffcke, Friedrich, and Hermann Kiewy. Ex Libris Herm. Kiewy. 1909.

MLA (9th ed.) Citation

Häffcke, Friedrich, and Hermann Kiewy. Ex Libris Herm. Kiewy. 1909.

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