MLA

Smith, John Raphael, 1752-1812, printmaker. Spectators at a print-shop in St. Paul's Church Yard [graphic].. published as the act directs [...] [not before 25 June 1774]. https://collections.library.yale.edu/catalog/33117840.

APA, 6th edition

Smith, John Raphael, 1752-1812, printmaker. (published as the act directs [...] [not before 25 June 1774])[Spectators at a print-shop in St. Paul's Church Yard [graphic].]. https://collections.library.yale.edu/catalog/33117840.