Cite

Beware... Drink only approved water. [graphic]

MLA

Beware... Drink Only Approved Water. [Graphic]. United States War Department, United States Government Printing Office, 12AD. https://collections.library.yale.edu/catalog/16046902.

APA, 6th edition

Beware... Drink only approved water. [graphic]. (12 C.E.). [Posters, War posters]. United States War Department, United States Government Printing Office. https://collections.library.yale.edu/catalog/16046902.