The Public international law draws its rules from the sources mentioned in Article 38 of the statute of the International Court of Justice of 1945. However, with the development of the international society, the appearance of the international organization as a person of the Public international law, and the inability of the sources mentioned in Article 38 of the statute of the International Court of Justice to set legal rules that can maintain international peace and security and solve the international political, economic, and social issues, the sources of the Public international law were not limited to those mentioned in Article 38. The international reality and interaction presented some practices that can be taken as sources of the Public international law. These practices include the acts issued by the states and the international organizations to express their individual wills. These acts, mainly those issued in the light of the individual will of the international organizations, contributed to creating many international rules in various branches of the Public international law. Hence, they formed the newest sources of the Public international law.