Cita APA (7a ed.)

Smith, J. D. (1885). Smith, John D. June 30, 1885 [to S. Watson]. Zenodo.

Cita Chicago Style (17a ed.)

Smith, John Donnell. Smith, John D. June 30, 1885 [to S. Watson]. Zenodo, 1885.

Cita MLA (9a ed.)

Smith, John Donnell. Smith, John D. June 30, 1885 [to S. Watson]. Zenodo, 1885.