MLA

A Garden Seat [Graphic]. No. 54 of R. Ackermann's Repository of Arts, 0AD. https://collections.library.yale.edu/catalog/10969014.

APA, 6th edition

A garden seat [graphic]. (0 C.E.). [Aquatints England London 1820, Etchings England London 1820, Watermarks (Paper)]. No. 54 of R. Ackermann's Repository of Arts. https://collections.library.yale.edu/catalog/10969014.