- Jurisprudence [a Lecture Delivered at Columbia University in the Series on Science, Philosophy and art, February 19, 1908]
- German land hunger and other underlying causes of the war
- The Disclosures from Germany: International Conciliation, No. 127, June, 1918
- Military Strategy Versus Diplomacy in Bismarck's Time and Afterwards
- Bismarck and German Unity (Classic Reprint)