MLA

Heath, William, 1795-1840, printmaker. Pie-ty!!! [graphic]. [30 October 1830]. https://collections.library.yale.edu/catalog/15808769.

APA, 6th edition

Heath, William, 1795-1840, printmaker. ([30 October 1830])[Pie-ty!!! [graphic]]. https://collections.library.yale.edu/catalog/15808769.