If you are interested in learning more about Biofeedback/Neurofeedback, here are some good resources to start your research!
www.isnr.org International Society for Neurofeedback and Research
www.aapb.org Association for Applied Psychophysiology and Biofeedback
www.bcia.org Biofeedback Certification International Alliance
www.eeginfo.com EEG Info
www.eegspectrum.com EEG Education and Research
A Symphony in the Brain by Jim Robbins
Getting Rid of Ritalin by Robert W. Hill, Ph.D and Eduardo Castro, M.D
ADD: the 20 Hour Solution by Mark Steinberg, Ph.D. and Siegfried Othmer, Ph.D., Robert D.
Biofeedback: A Practitioners Guide by Mark Schwartz
The Nuerofeedback Book by Michael and Lynda Thompson
The ADD Book by William Sears M.D. and Lynda Thompson Ph.D.
Neurofeedback in the Treatment of Developmental Trauma by Sebern E. Fisher
Functional Neuroanatomy by Michael Thompson M.D. and Lynda Thompson Ph.D.
Hammond, DC, What is Neurofeedback: An Update, Journal of Neurotherapy, 2011, 15:305–336, available at: http://www.isnr.org/neurofeedback-info/WhatIsNeurofeedbackUpdate.pdf