APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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