There is a tremendous amount of material on the web so there is no need for me to list articles.
There are now many books available about neurofeedback and biofeedback. I have read many but the few that I have enjoyed, found to be informative and good introductions are listed below.
A Symphony in The Brain
Jim Robbins
A very good introduction to neurofeedback
Beyond Biofeedback
Elmer and Alyce Green
This book I have read many times and really gets the ideaof biofeedback and what it entails across.
Open Focused Mind
By Dr. Les Fehmi
I am a follower of Dr. Fehmi and his Open Focus method. I have introduced many of my clients to his recordings.