MLA

Roberts, Robert, active 1820s, printmaker. A sketch of the interior view of the House of Lords, representing the trial of her majesty Queen Caroline [graphic]. [1 October 1820]. https://collections.library.yale.edu/catalog/33114435.

APA, 6th edition

Roberts, Robert, active 1820s, printmaker. ([1 October 1820])[A sketch of the interior view of the House of Lords, representing the trial of her majesty Queen Caroline [graphic]]. https://collections.library.yale.edu/catalog/33114435.