Why we went to war.
I.
Submarine warfare.
II.
Prussian militarism.
David F. Houston, secretary of agriculture.

APA Citation

Houston, D. Franklin. (1918). Why we went to war. [Washington?.

MLA Citation

Houston, David Franklin, 1866-1940. Why We Went to War. [Washington?, 1918.

Warning: These citations may not always be complete (especially for serials).