MLA

Palmquist, Peter E. (1936-2003). Bradley & Rulofson. Box 355, folder 1-12. circa 1840-2003. https://collections.library.yale.edu/catalog/33540055.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 355, folder 1-12"])(circa 1840-2003)[Bradley & Rulofson]. https://collections.library.yale.edu/catalog/33540055.