MLA

Mr. Mattocks and Mr. Quick in the Characters of Don Ferdinand and Isaac Mendoza in The Duenna. [Graphic]. Printed for & sold by Carington Bowles, at his Map & Print Warehouse, No. 69 in St. Pauls Church Yard, London, 0AD. https://collections.library.yale.edu/catalog/33191817.

APA, 6th edition

Mr. Mattocks and Mr. Quick in the characters of Don Ferdinand and Isaac Mendoza in The Duenna. [graphic]. (0 C.E.). [Group portraits, Portrait prints, Mezzotints England London 1777]. Printed for & sold by Carington Bowles, at his Map & Print Warehouse, No. 69 in St. Pauls Church Yard, London. https://collections.library.yale.edu/catalog/33191817.