Cita APA (7a ed.)

Austin, C. F. (1878). Austin, Coe F. Oct. 28, 1878 [to S. Watson] [postcard]. Zenodo.

Cita Chicago Style (17a ed.)

Austin, Coe F. Austin, Coe F. Oct. 28, 1878 [to S. Watson] [postcard]. Zenodo, 1878.

Cita MLA (9a ed.)

Austin, Coe F. Austin, Coe F. Oct. 28, 1878 [to S. Watson] [postcard]. Zenodo, 1878.