Cite

William Henry Cavendish Bentinck, Duke of Portland, & Lord Edward Bentinck [graphic]

MLA

Smith, John Raphael, 1752-1812, printmaker. William Henry Cavendish Bentinck, Duke of Portland, & Lord Edward Bentinck [graphic]. [24 June 1780]. https://collections.library.yale.edu/catalog/33191996.

APA, 6th edition

Smith, John Raphael, 1752-1812, printmaker. ([24 June 1780])[William Henry Cavendish Bentinck, Duke of Portland, & Lord Edward Bentinck [graphic]]. https://collections.library.yale.edu/catalog/33191996.