MLA

Somnambula! [Graphic] : Published by G. Tregear, 96 Cheapside London, 0AD. https://collections.library.yale.edu/catalog/17338369.

APA, 6th edition

Somnambula! [graphic] : (0 C.E.). [Satires (Visual works), Lithographs]. Published by G. Tregear, 96 Cheapside London. https://collections.library.yale.edu/catalog/17338369.