MLA

Seymour, Robert, 1798-1836, printmaker. The lion that was mistaken for an ass The ass that some mistake for a lion ; Loyalty at Oxford. [graphic]. [1 November 1835]. https://collections.library.yale.edu/catalog/33379693.

APA, 6th edition

Seymour, Robert, 1798-1836, printmaker. ([1 November 1835])[The lion that was mistaken for an ass The ass that some mistake for a lion ; Loyalty at Oxford. [graphic]]. https://collections.library.yale.edu/catalog/33379693.