Cite

Head-quarters of the United States Sanitary Commission at Gettysburg, Pennsylvania [graphic].

MLA

Head-Quarters of the United States Sanitary Commission at Gettysburg, Pennsylvania [Graphic]. Harper & Brothers, 0AD. https://collections.library.yale.edu/catalog/17339999.

APA, 6th edition

Head-quarters of the United States Sanitary Commission at Gettysburg, Pennsylvania [graphic]. (0 C.E.). [Wood engravings]. Harper & Brothers. https://collections.library.yale.edu/catalog/17339999.