APA (7th ed.) Citation

Rau, E. A. (1891). Rau, Eugene Abraham May 12, 1891 [Postcard]. Zenodo.

Chicago Style (17th ed.) Citation

Rau, Eugene A. Rau, Eugene Abraham May 12, 1891 [Postcard]. Zenodo, 1891.

MLA (9th ed.) Citation

Rau, Eugene A. Rau, Eugene Abraham May 12, 1891 [Postcard]. Zenodo, 1891.

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