Soldiers digging themselves in for the night

Chicago citation style
United States. Army. Signal Corps. Soldiers digging themselves in for the night. 1918-10-18. Retrieved from the Digital Public Library of America, http://cdm15138.contentdm.oclc.org/cdm/ref/collection/WWI/id/16. (Accessed September 15, 2019.)
APA citation style
United States. Army. Signal Corps, (1918-10-18) Soldiers digging themselves in for the night. Retrieved from the Digital Public Library of America, http://cdm15138.contentdm.oclc.org/cdm/ref/collection/WWI/id/16
MLA citation style
United States. Army. Signal Corps. Retrieved from the Digital Public Library of America <http://cdm15138.contentdm.oclc.org/cdm/ref/collection/WWI/id/16>.
Note: These citations are programmatically generated and may be incomplete.