Book Reports / letter from birmingham jail / critique analysis by MLK JR [4]

How to write a critique essay about MLK's Letter From Birmingham Jail

I'm a college student and I have to write a 3-page critique essay about Letter From Birmingham Jail by Martin Luther King. I've already wrote an essay but my professor refused to take it as I need an expert opinion as well. I hope you can help me find sources as I've used Google and failed to find what I wanted.

Thanks in advance.