MLA

Byron, Frederick George, 1764-1792, attributed name. The English ambassador and his suite before the King at Madrid, 1790 [graphic]. May 12, 1790.. https://collections.library.yale.edu/catalog/16227143.

APA, 6th edition

Byron, Frederick George, 1764-1792, attributed name. (May 12, 1790.)[The English ambassador and his suite before the King at Madrid, 1790 [graphic]]. https://collections.library.yale.edu/catalog/16227143.