MLA

Cardon, Anthony, 1772-1813, printmaker. His Majesty King George III from an original picture by Sir William Beechey, R.A. in his own possession / [graphic]. [1 March 1809]. https://collections.library.yale.edu/catalog/33191887.

APA, 6th edition

Cardon, Anthony, 1772-1813, printmaker. ([1 March 1809])[His Majesty King George III from an original picture by Sir William Beechey, R.A. in his own possession / [graphic]]. https://collections.library.yale.edu/catalog/33191887.