Gen. John Clem, the "drummer boy of Shiloh". Picture made at the age of 12 (1863).

Chicago citation style
War Department. Office of the Chief Signal Officer. (8/1/1866 - 9/18/1947). Gen. John Clem, the "drummer boy of Shiloh". Picture made at the age of 12 (1863).. 1860-01-01/1865-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/530397. (Accessed June 20, 2018.)
APA citation style
War Department. Office of the Chief Signal Officer. (8/1/1866 - 9/18/1947), (1860-01-01/1865-12-31) Gen. John Clem, the "drummer boy of Shiloh". Picture made at the age of 12 (1863).. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/530397
MLA citation style
War Department. Office of the Chief Signal Officer. (8/1/1866 - 9/18/1947). Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/530397>.
Note: These citations are programmatically generated and may be incomplete.