Germany. Heer
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The German Army From Within, by a British Officer Who Has Served in It (second edition; London et al.: Hodder and Stoughton, 1914), by B. Granville Baker, ed. by Thomas Burke- Operations of Encircled Forces: German Experiences in Russia, by United States Army (illustrated HTML at US Army CMH)
- The Borderland of Czar and Kaiser: Notes From Both Sides of the Russian Frontier (New York: Harper and Bros., 1895), by Poultney Bigelow, illust. by Frederic Remington
- Foot Artillery Index to the German Forces in the Field (2nd revision, 2 volumes; London: The General Staff, 1918), by Great Britain War Office General Staff (page images at HathiTrust)
- The Guilt of the German Army (New York: Macmillan, 1942), by John H. E. Fried (page images at HathiTrust)
- Histories of Two Hundred and Fifty-One Divisions of the German Army Which Participated in the War (1914-1918) (Washington: GPO, 1920), by United States. Army. American Expeditionary Forces. General Staff* United States American Expeditionary Forces General Staff
- A European Anabasis: Western European Volunteers in the German Army and SS, 1940-1945 (c2003), by Kenneth W. Estes (illustrated HTML and PDF files at gutenberg-e.org)
- A European Anabasis: Western European Volunteers in the German Army and SS, 1940-1945 (c2003), by Kenneth W. Estes (illustrated HTML and PDF files at gutenberg-e.org)
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