Airplanes - Miscellaneous - Marines at practice with airplane guns; Miami, FLA. The gunner or observer aboard an airship must be on the alert for enemy planes. These marine aviators are practicing shooting at miniature planes

Chicago citation style
War Department. 1789-9/18/1947. Airplanes - Miscellaneous - Marines at practice with airplane guns; Miami, FLA. The gunner or observer aboard an airship must be on the alert for enemy planes. These marine aviators are practicing shooting at miniature planes. 1917-01-01/1918-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/17341340. (Accessed October 17, 2018.)
APA citation style
War Department. 1789-9/18/1947, (1917-01-01/1918-12-31) Airplanes - Miscellaneous - Marines at practice with airplane guns; Miami, FLA. The gunner or observer aboard an airship must be on the alert for enemy planes. These marine aviators are practicing shooting at miniature planes. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/17341340
MLA citation style
War Department. 1789-9/18/1947. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/17341340>.
Note: These citations are programmatically generated and may be incomplete.