MLA

Purcell, Richard, approximately 1736-approximately 1765, printmaker. The sleepy congregation [graphic]. [between 1746 and 1766]. https://collections.library.yale.edu/catalog/11047068.

APA, 6th edition

Purcell, Richard, approximately 1736-approximately 1765, printmaker. ([between 1746 and 1766])[The sleepy congregation [graphic]]. https://collections.library.yale.edu/catalog/11047068.