MLA

Keppler, Joseph Ferdinand, 1838-1894, printmaker. Quackery -- medical minstrels performing for the benefit of their former patients -- no other dead-heads admitted [graphic].. [1879]. https://collections.library.yale.edu/catalog/17339372.

APA, 6th edition

Keppler, Joseph Ferdinand, 1838-1894, printmaker. ([1879])[Quackery -- medical minstrels performing for the benefit of their former patients -- no other dead-heads admitted [graphic].]. https://collections.library.yale.edu/catalog/17339372.