MLA

Howarth, F. M. (Franklin Morris), 1865-1908. Photographic proof .... 1894 August 8. https://collections.library.yale.edu/catalog/2057777.

APA, 6th edition

Howarth, F. M. (Franklin Morris), 1865-1908. (1894 August 8)[Photographic proof ...]. https://collections.library.yale.edu/catalog/2057777.