MLA

Execution of Robert Watt for High Treason, at Edinburgh Octr. 15th 1794 [Graphic]. J. Exshaw, 0AD. https://collections.library.yale.edu/catalog/16702970.

APA, 6th edition

Execution of Robert Watt for high treason, at Edinburgh Octr. 15th 1794 [graphic]. (0 C.E.). [Periodical illustrations, Etchings Ireland Dublin 1794, Engravings Ireland Dublin 1794]. J. Exshaw. https://collections.library.yale.edu/catalog/16702970.