War in our time
MLA
Speier, Hans, and Alfred Kähler. War In Our Time. First edition. New York: W.W. Norton & company, inc., 1939
APA, 7th edition
Speier, H., & Kähler, A. (1939). War in our time. First edition. New York: W.W. Norton & company, inc
Chicago, 17th edition
Speier, Hans., and Alfred Kähler. War in our time. First edition. New York: W.W. Norton & company, inc., 1939