MLA

Gillray, James, 1756-1815. Fraying sprats. Folder VIII-26. 1791 November 28. https://collections.library.yale.edu/catalog/11859375.

APA, 6th edition

Gillray, James, 1756-1815. (["Folder VIII-26"])(1791 November 28)[Fraying sprats]. https://collections.library.yale.edu/catalog/11859375.