MLA

Day, William, 1797-1845, lithographer. The Siamese youths (aged 18) as now exhibited in the Egyptian hall, Piccadilly / [graphic]. 1st Decr., 1829.. https://collections.library.yale.edu/catalog/11128843.

APA, 6th edition

Day, William, 1797-1845, lithographer. (1st Decr., 1829.)[The Siamese youths (aged 18) as now exhibited in the Egyptian hall, Piccadilly / [graphic]]. https://collections.library.yale.edu/catalog/11128843.