MLA

Wallis, Thomas, -1839, printmaker. A saadi, or Egyptian quack, curing a sick man by pretending conjurations with serpents [graphic]. April 1806.. https://collections.library.yale.edu/catalog/17338394.

APA, 6th edition

Wallis, Thomas, -1839, printmaker. (April 1806.)[A saadi, or Egyptian quack, curing a sick man by pretending conjurations with serpents [graphic]]. https://collections.library.yale.edu/catalog/17338394.