MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer, Baltimore[?] Portrait of man, left elbow on table. Daguerreotype, sixth plate. Box 1, folder 4. circa 1855. https://collections.library.yale.edu/catalog/2002066.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 1, folder 4"])(circa 1855)[Unknown photographer, Baltimore[?] Portrait of man, left elbow on table. Daguerreotype, sixth plate]. https://collections.library.yale.edu/catalog/2002066.