MLA

His Late Most Excellent Majesty King George the Third from an Original Drawing Taken at the Age of 82 in the 60th Year of His Reign. [Graphic]. Published 1, March 1820, for the proprietor and sold by Messrs. Cribb & Son Holborn, and R. Cooper, No. 1 Edward Street, Hampstead Road, 0AD. https://collections.library.yale.edu/catalog/10955250.

APA, 6th edition

His late most excellent majesty King George the Third from an original drawing taken at the age of 82 in the 60th year of his reign. [graphic]. (0 C.E.). [Portrait prints, Engravings England London 1820]. Published 1, March 1820, for the proprietor and sold by Messrs. Cribb & Son Holborn, and R. Cooper, No. 1 Edward Street, Hampstead Road. https://collections.library.yale.edu/catalog/10955250.