Air raid warning system

Chicago citation style
United States. War Dept. Air raid warning system. [1941]. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/001628284. (Accessed November 17, 2018.)
APA citation style
United States. War Dept, ([1941]) Air raid warning system. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/001628284
MLA citation style
United States. War Dept. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/001628284>.
Note: These citations are programmatically generated and may be incomplete.