MLA

Le Roy, Bruce, and Washington State Historical Society. The English Ambassador and His Suite before the King at Madrid. Washington State Historical Society, 1970. https://collections.library.yale.edu/catalog/2069291.

APA, 6th edition

Le Roy, B., & Society, W. S. H. (1970). The English ambassador and his suite before the King at Madrid [Broadsides, Facsimiles (Reproductions)]. Washington State Historical Society. https://collections.library.yale.edu/catalog/2069291.