Final answer:
If a nation refuses to accept an ICJ judgment against it, the plaintiff nation may seek recourse through the UN Security Council. No other legal organizations mentioned have the authority to enforce ICJ judgments, as international law enforcement relies on state consent and political mechanisms.
Step-by-step explanation:
When a nation has consented to bring a case against itself before the International Court of Justice (ICJ) and then refuses to accept a judgment against it, the options for the plaintiff nation to seek recourse are limited and involve political and diplomatic pressures rather than legal enforcement.
While there are other organizations and courts, such as the American Arbitration Association, UN Conference on International Trade Law, International Chamber of Commerce, and the European Court of Justice, they deal with different types of disputes and do not have the authority to enforce ICJ rulings.