MLA

Chapman, J. (John), active 1792-1823, printmaker. The night mare [graphic]. [1 May 1799]. https://collections.library.yale.edu/catalog/10941344.

APA, 6th edition

Chapman, J. (John), active 1792-1823, printmaker. ([1 May 1799])[The night mare [graphic]]. https://collections.library.yale.edu/catalog/10941344.