APA (7th ed.) Citation

Smith, J. D. (1880). Smith, John D. June 5, 1880 [to S. Watson]. Zenodo.

Chicago Style (17th ed.) Citation

Smith, John Donnell. Smith, John D. June 5, 1880 [to S. Watson]. Zenodo, 1880.

MLA (9th ed.) Citation

Smith, John Donnell. Smith, John D. June 5, 1880 [to S. Watson]. Zenodo, 1880.

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