MLA

Palmquist, Peter E. (1936-2003). Ambrotype in a case, of five women, identified as members of the Peralta family. Box 17, folder 162. circa 1855. https://collections.library.yale.edu/catalog/2005026.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 17, folder 162"])(circa 1855)[Ambrotype in a case, of five women, identified as members of the Peralta family]. https://collections.library.yale.edu/catalog/2005026.