1. Adcock, Frank, and D. J. Mosley. Diplomacy in Ancient Greece. 1st edition. London: Thames and Hudson, 1975.
2. Apasiev, Dimitar. ‘Imperium Militiae (I)’. Iustinianus Primus Law Review 1, no. 8 (2014): 1–16.
3. Asbeck, Hans. Das Ultimatum im modernen Völkerrecht. Studie. Berlin-Grunewald: Rothschild, 1933.
4. Augustine, Saint, and Marcus Dods. The City of God, Vol. 2. Translated by Marcus Dods. Edinburgh T. & T. Clark, 1913. http://archive.org/details/cityofgodtransla02auguuoft.
5. Baldwin, S. E. ‘The Share of the President of the United States in a Declaration of War’. The American Journal of International Law 12, no. 1 (1918): 1–14.