MLA

A Flat between Two Sharps [Graphic]. Printed for & sold by Carington Bowles, No. 69 St. Paul's Church Yard, London, 14AD. https://collections.library.yale.edu/catalog/10732529.

APA, 6th edition

A flat between two sharps [graphic]. (14 C.E.). [Satires (Visual works) England 1791, Mezzotints England London 1791]. Printed for & sold by Carington Bowles, No. 69 St. Paul's Church Yard, London. https://collections.library.yale.edu/catalog/10732529.