MLA

Palmquist, Peter E. (1936-2003). Daguerreotype in a case, of a man, identified as brick mason holding a trowel. Box 3, folder 21. circa 1859. https://collections.library.yale.edu/catalog/2056725.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 3, folder 21"])(circa 1859)[Daguerreotype in a case, of a man, identified as brick mason holding a trowel]. https://collections.library.yale.edu/catalog/2056725.