Cite

Two ambrotypes in one case, one depicting a man and the other a woman

MLA

Palmquist, Peter E. (1936-2003). Two ambrotypes in one case, one depicting a man and the other a woman. Box 1, folder 3. circa 1858. https://collections.library.yale.edu/catalog/32468579.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 1, folder 3"])(circa 1858)[Two ambrotypes in one case, one depicting a man and the other a woman]. https://collections.library.yale.edu/catalog/32468579.