There are several books out there, that you might easily download on kindle if interested. This one seems to have a pretty good rating for example on Goodreads, seems to do a lot of analysis of the local news paper reporting at the time. But there are several other books to pick from.
https://www.goodreads.com/book/show/45732946-tulsa-1921
https://www.goodreads.com/book/show/45732946-tulsa-1921