Reddit reviews Civil Rights: RHETORIC OR REALITY

I will check it out, thanks for the recommendation.

I read Civil Rights Rhetoric or Reality and it was remarkably good and very thought provoking

I doubt they're peer reviewed, and I don't see why that would matter, except to someone who doesn't know anything about what peer review is and just wants to use it as a litmus test. Hopefully, the reader is capable of reading critically and recognizing whether or not arguments are good and based on well-sourced data.

That said, Sowell is an accomplished scholar, and if you have access to a good university library with peer-reviewed economic journals and monographs, then you'll be able to find plenty of peer-reviewed work from him, including on this topic by searching the databases that anybody who understands what peer review is would already be familiar with.

But see especially the following:
https://www.amazon.com/Civil-Rights-RHETORIC-Thomas-Sowell-ebook/dp/B000RO9VI6/
https://www.amazon.com/Ethnic-America-History-Thomas-Sowell-ebook/dp/B00ANRU64A/
https://www.amazon.com/Discrimination-Disparities-Thomas-Sowell-ebook/dp/B07JLS7P8D/