Here are some resources that you might find helpful

What is Neurofeedback, featuring neurofeedback pioneers Sue and Siegfried Othmer.

Neurofeedback: Training your brain without using medication : ABC15 (Arizona) Smart Family

Go deeper into the science behind neurofeedback:

Clinical evidence for using Neurofeedback and Biofeedback to treat mood and anxiety disorders:

http://sitn.hms.harvard.edu/flash/2017/brain-training-future-psychiatric-treatment/

The Association for Applied Psychophysiology and Biofeedback (AAPB) library of documents on the efficacy of using NF to treat clinical and performance related problems:

http://sitn.hms.harvard.edu/flash/2017/brain-training-future-psychiatric-treatment/

Other Resources

Brain Training: The Future of Psychiatric Treatment : Harvard University Graduate School, Science in the News

http://sitn.hms.harvard.edu/flash/2017/brain-training-future-psychiatric-treatment/

What is Neurofeedback : Psychology Today

today.com/blog/the-resilient-brain/201410/what-is-neurofeedback