Cite

Ambrotype of a man, identified as E. E. (Elmer Ephraim) Ellsworth (1837-1861), in an oval brass mat and brass preserver in a case of a copy photograph

MLA

Meserve, Frederick Hill, 1865-1962. Ambrotype of a man, identified as E. E. (Elmer Ephraim) Ellsworth (1837-1861), in an oval brass mat and brass preserver in a case of a copy photograph. Box 47, folder 840. circa 1861. https://collections.library.yale.edu/catalog/32369272.

APA, 6th edition

Meserve, Frederick Hill, 1865-1962. (["Box 47, folder 840"])(circa 1861)[Ambrotype of a man, identified as E. E. (Elmer Ephraim) Ellsworth (1837-1861), in an oval brass mat and brass preserver in a case of a copy photograph]. https://collections.library.yale.edu/catalog/32369272.