- The Interparliamentary union, by Christian Lous Lange, 1932
- Parliamentary government and the Interparliamentary Union (Pamphlet series / World Peace Foundation) by Christian Lous Lange, 1911
- The conditions of a lasting peace;: A statement of the work of the union, by Christian Lous Lange, 1917
- The American peace treaties,: Full texts of treaties with an introduction and a commentary (Interparliamentary union) by Christian Lous Lange, 1915
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