MLA

Palmquist, Peter E. (1936-2003). Swanlund Studio. Box 99. circa 1850-2003. https://collections.library.yale.edu/catalog/12246649.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 99"])(circa 1850-2003)[Swanlund Studio]. https://collections.library.yale.edu/catalog/12246649.