There is peer reviewed research on this topic all over the web. But even in this wikipedia article, for those that are able to use basic reasoning skills, it repeatedly referenced peer reviewed studies for it’s numbers. People use wikipedia because it’s easy, not because it’s some arbiter of truth.

No one wants to provide a bibliography for some random on the Internet who wouldn’t accept new information even if I gave you a time machine that placed you at an execution of an academic or business owner during that time. Waste of everyone’s time.