APA (7th ed.) Citation

Urban, I. (1891). Urban, Ignatz May 9, 1891 [to S. Watson]. Zenodo.

Chicago Style (17th ed.) Citation

Urban, Ignaz. Urban, Ignatz May 9, 1891 [to S. Watson]. Zenodo, 1891.

MLA (9th ed.) Citation

Urban, Ignaz. Urban, Ignatz May 9, 1891 [to S. Watson]. Zenodo, 1891.

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