MLA

Palmquist, Peter E. (1936-2003). Eureka News Company. Box 57. circa 1850-2003. https://collections.library.yale.edu/catalog/12246516.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 57"])(circa 1850-2003)[Eureka News Company]. https://collections.library.yale.edu/catalog/12246516.