Ritically evaluate the effectiveness and legitimacy of one international organisation (eg the UN).

I would like a British University academic standard essay of 2500 words double spaced font 12. I would like at least 15 sources from academic journals and books only. None from news articles. Please make sure you use all 15 DIFFERENT sources that are old and new as I always get less than I request.
Have a strong thesis and argue it throughout the essay, each paragraph must be linked to the question. Include a outline in the introduction.
-Please answer the question completely by providing examples and strong counter arguments.
Please discuss all aspects of the UN and use actual evidence and events that caused the UN to be effective or ineffective.
The overall theme of the essay should be that the UN does in fact need amendments and change including the UN security council.