"This is a reprint in book form of three essays recently published by Dr. Goebel in the Columbia Law Review. The author attempts, as he himself has expressed it, 'to indicate that the historical background of the doctrine of equality of states in international law is of considerable importance not only for the purpose of fixing the origin of the doctrine as a coherent principle of law, but also because it indicates how necessary and inevitable the notion has been from the very inception of international relationships in Europe.'"
Dickinson, Edwin D. Review of Equality of States, a Study in the History of Law, by J. Goebel. Harv. L. Rev. 37 (1924): 405–7.