MLA

Gounod Society (New Haven, Conn.). Minutes of meetings. Box 1, folder 5. 1891-1903. https://collections.library.yale.edu/catalog/32551314.

APA, 6th edition

Gounod Society (New Haven, Conn.). (["Box 1, folder 5"])(1891-1903)[Minutes of meetings]. https://collections.library.yale.edu/catalog/32551314.