MLA

Spence, Joseph, 1699-1768. Kimbolton Castle in Huntingdonshire: Duke of Manchester. Box 6, folder 184. ca. 1745-46?. https://collections.library.yale.edu/catalog/2112300.

APA, 6th edition

Spence, Joseph, 1699-1768. (["Box 6, folder 184"])(ca. 1745-46?)[Kimbolton Castle in Huntingdonshire: Duke of Manchester]. https://collections.library.yale.edu/catalog/2112300.