Cite

An hieroglyphic letter from the [Princess of Wales] to the [Earl of Bute] found in the neighbourhood of South Audley Street. Postage sixpence. [graphic]

MLA

An Hieroglyphic Letter from the [Princess of Wales] to the [Earl of Bute] Found in the Neighbourhood of South Audley Street. Postage Sixpence. [Graphic]. E. Sumpter, 0AD. https://collections.library.yale.edu/catalog/10713184.

APA, 6th edition

An hieroglyphic letter from the [Princess of Wales] to the [Earl of Bute] found in the neighbourhood of South Audley Street. Postage sixpence. [graphic]. (0 C.E.). [Rebuses, Book illustrations, Satires (Visual works) England 1763, Etchings England London 1763]. E. Sumpter. https://collections.library.yale.edu/catalog/10713184.