The excellent study referenced below is a “comprehensive” review of psychological effects of brainwave entrainment. Although the definition of comprehensive can be debated, the study is an excellent review of entrainment studies. By reviewing a broad base of research, this study provides a good map of existing work, helping to identify areas for further research and cull practices that can be used for practical mind entrainment programs today.
Although many of the key studies are readily available independently, this paper is a go-to piece of research when designing brainwave entrainment programs.
Alternative Therapies in Health and Medicine (2008, September; vol 14:5). A Comprehensive Review of the Psychological Effects of Brainwave Entrainment; Tina L. Huang, PhD; Christine Charyton, PhD.
http://www.alternative-therapies.com/