This primary source comes from the Records of the American Expeditionary Forces (World War I).
Full Citation: Rough Draft of Memo for Chief of Staff from Pershing; 9/11/1918; Records of the American Expeditionary Forces (World War I), Record Group 120. [Online Version, https://docsteach.org/documents/document/rough-draft-of-memo-for-chief-of-staff-from-pershing, April 20, 2024]