MLA

Houston, Richard, 1721?-1775, printmaker. The Right Noble Charles Marquis of Rockingham, Earl of Malton, Viscount Higham of Higham Ferrers, Baron Rockingham of Rockingham ... [graphic]. [approximately 1758]. https://collections.library.yale.edu/catalog/33191913.

APA, 6th edition

Houston, Richard, 1721?-1775, printmaker. ([approximately 1758])[The Right Noble Charles Marquis of Rockingham, Earl of Malton, Viscount Higham of Higham Ferrers, Baron Rockingham of Rockingham ... [graphic]]. https://collections.library.yale.edu/catalog/33191913.