What are some good websites for this topic?

I am writing a dissertation on the Development of Profanity and the effects that it has on people and i'm having a hard time finding some good sources. I have a few, but they're not really what i'm looking for. I have a lot of info on how in effects people, but I don't really have anything on how it originally developed. Can someone help? Any authors/articles/books/papers, etc would be super helpful! Thanks!!!!