MLA

Palmquist, Peter E. (1936-2003). Phillips, Denver. Box 84. circa 1850-2003. https://collections.library.yale.edu/catalog/12246619.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 84"])(circa 1850-2003)[Phillips, Denver]. https://collections.library.yale.edu/catalog/12246619.