MLA

Palmquist, Peter E. (1936-2003). Ambrotype with a horizontal orientation in half case of five women and four men. Box 44, folder 60. circa 1858-61. https://collections.library.yale.edu/catalog/2056731.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 44, folder 60"])(circa 1858-61)[Ambrotype with a horizontal orientation in half case of five women and four men]. https://collections.library.yale.edu/catalog/2056731.