MLA

[King] of Prussias s[Peech] [to] [Britannia] 1756 [Graphic]. Publish'd according to act Novr. 20, 1756, by Darly & Edwards at [the] Acorn facing Hungerford, Strand, 0AD. https://collections.library.yale.edu/catalog/10714666.

APA, 6th edition

[King] of Prussias s[peech] [to] [Britannia] 1756 [graphic]. (0 C.E.). [Caricatures and cartoons, Satires (Visual works) England 1756, Rebuses, Etchings England London 1756, Book illustrations]. Publish'd according to act Novr. 20, 1756, by Darly & Edwards at [the] Acorn facing Hungerford, Strand. https://collections.library.yale.edu/catalog/10714666.