Cite

Unknown photographer Half-length portrait of a young man, seated with hand on table. Ambrotype, sixth plate

MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Half-length portrait of a young man, seated with hand on table. Ambrotype, sixth plate. Box 3, folder 30. circa 1860. https://collections.library.yale.edu/catalog/2002050.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 3, folder 30"])(circa 1860)[Unknown photographer Half-length portrait of a young man, seated with hand on table. Ambrotype, sixth plate]. https://collections.library.yale.edu/catalog/2002050.