Reply to Convergent technologies and it's impact on DJing

Writing an essay on digital technology and how it's taking over DJing.

Was wondering if anyone has any useful links to articles or interviews about this that I could use, I'm trying to gather all the research I can at the moment.

I've used a lot of articles from this site, but I was wondering if anyone had any other sources.

At the moment I'm struggling to find sources to reference early convergence; movement from belt driven turntables to motors etc.

If anyone can help it will be greatly appreciated.