MLA

Margaret Nicholson Attempting to Assassinate His Majesty King George III : at the Garden Entrance of St. James's Palace, 2d August 1786 [Graphic]. Printed for & sold by Carington Bowles No. 69, St. Paul's Church Yard, London, 0AD. https://collections.library.yale.edu/catalog/10728166.

APA, 6th edition

Margaret Nicholson attempting to assassinate His Majesty King George III : at the garden entrance of St. James's Palace, 2d August 1786 [graphic]. (0 C.E.). [Mezzotints England London 1786]. Printed for & sold by Carington Bowles No. 69, St. Paul's Church Yard, London. https://collections.library.yale.edu/catalog/10728166.