APA (7th ed.) Citation

Hornhaver, H., & Hirschfelder, H. (1980). Ex Libris Herbert Hirschfelder.

Chicago Style (17th ed.) Citation

Hornhaver, Hans, and Herbert Hirschfelder. Ex Libris Herbert Hirschfelder. 1980.

MLA (9th ed.) Citation

Hornhaver, Hans, and Herbert Hirschfelder. Ex Libris Herbert Hirschfelder. 1980.

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