MLA

Townley, Charles, 1746-1800, printmaker, publisher. This portrait of Samuel Johnson, L.L.D. is with the greatest respect dedicated to James Boswell Esq., by his most obedient, humble servant, Charles Townley [graphic]. [20 February 1792]. https://collections.library.yale.edu/catalog/33191870.

APA, 6th edition

Townley, Charles, 1746-1800, printmaker, publisher. ([20 February 1792])[This portrait of Samuel Johnson, L.L.D. is with the greatest respect dedicated to James Boswell Esq., by his most obedient, humble servant, Charles Townley [graphic]]. https://collections.library.yale.edu/catalog/33191870.