MLA

Grignion, Charles, 1721-1810, printmaker. The Protector Duke of Somerset & the great Sr Edward Seymour introducing Liberty to Britannia [graphic]. [1770]. https://collections.library.yale.edu/catalog/10713523.

APA, 6th edition

Grignion, Charles, 1721-1810, printmaker. ([1770])[The Protector Duke of Somerset & the great Sr Edward Seymour introducing Liberty to Britannia [graphic]]. https://collections.library.yale.edu/catalog/10713523.