MLA

Harriott, William Henry, -1839, artist. Cato Street Conspiracy. : Interior view of the hay-loft where Thistlewood & the conspirators assembled to assasinate His Majesty's ministers on the night of Wednesday the 23rd of Feb.y 1820. Feb. 26, 1820.. https://collections.library.yale.edu/catalog/33300099.

APA, 6th edition

Harriott, William Henry, -1839, artist. (Feb. 26, 1820.)[Cato Street Conspiracy. : Interior view of the hay-loft where Thistlewood & the conspirators assembled to assasinate His Majesty's ministers on the night of Wednesday the 23rd of Feb.y 1820]. https://collections.library.yale.edu/catalog/33300099.