APA (7th ed.) Citation

Preusse, R., & Fogedgaard, H. (1950). Ex Libris Helmer Fogedgaard.

Chicago Style (17th ed.) Citation

Preusse, Richard, and Helmer Fogedgaard. Ex Libris Helmer Fogedgaard. [Leipzig, 1950.

MLA (9th ed.) Citation

Preusse, Richard, and Helmer Fogedgaard. Ex Libris Helmer Fogedgaard. 1950.

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