Extensive bibliographies of neurofeedback and its scientific evidence are available:

Brain Science International (last updated Sep 2014): http://www.brainsinternational.com/default/assets/File/NFB%20Biblio.pdf

International Society of Neurofeedback Research (Very extensive, listed by disorder): https://www.isnr.org/isnr-comprehensive-bibliography

Neurofeedback Alliance: http://neurofeedbackalliance.org

Other Resources:

 Difficulties, Depression, Anxiety,

Comprehensive list of studies ( Bibliography) where Neurotherapy has been used for various disorders

A discussion on the usefulness of Nutrition and Neurotherapy in the treatment of ADHD Dr. Robyn Cosford MBBS and Jacques Duff Psychologist Journal of complementary Medicine

A Comparison of Nutrients to Stimulant Medication in the treatment of ADHD

A white paper from ISNR and  AAPB outlining their position on Neurotherapy as a treatment for ADHD

Applied psychophysiology

Quantitative EEG