MLA

Watson, James, 1740-1790, printmaker. John Duke of Argyll hereditary Great Master of the household in Scotland, Colonel of His Majesty's Gray Dragoons, Governor of Limerick, General of Horse & Knt. of the most Antient Order of the Thistles &c / [graphic]. [15 January 1769]. https://collections.library.yale.edu/catalog/10980797.

APA, 6th edition

Watson, James, 1740-1790, printmaker. ([15 January 1769])[John Duke of Argyll hereditary Great Master of the household in Scotland, Colonel of His Majesty's Gray Dragoons, Governor of Limerick, General of Horse & Knt. of the most Antient Order of the Thistles &c / [graphic]]. https://collections.library.yale.edu/catalog/10980797.