MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Bust-length portrait of Gerrit Smith; white man facing left. Daguerreotype, sixth plate. Box 1, folder 6. circa 1855. https://collections.library.yale.edu/catalog/2002068.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 1, folder 6"])(circa 1855)[Unknown photographer Bust-length portrait of Gerrit Smith; white man facing left. Daguerreotype, sixth plate]. https://collections.library.yale.edu/catalog/2002068.