Cite

The Siamese boys Aged 18. [graphic]

MLA

The Siamese Boys Aged 18. [Graphic]. publisher not identified, 0AD. https://collections.library.yale.edu/catalog/17338593.

APA, 6th edition

The Siamese boys Aged 18. [graphic]. (0 C.E.). [Portraits prints, Lithographs]. publisher not identified. https://collections.library.yale.edu/catalog/17338593.