APA (7th ed.) Citation

Hewitt, J. (1949). Portrait by Thomas Robinson of Dr. James Armstrong (1780-1839).

Chicago Style (17th ed.) Citation

Hewitt, John. Portrait by Thomas Robinson of Dr. James Armstrong (1780-1839). 1949.

MLA (9th ed.) Citation

Hewitt, John. Portrait by Thomas Robinson of Dr. James Armstrong (1780-1839). 1949.

Warning: These citations may not always be 100% accurate.