1. Patel, C. H., Lancet. 1973, ii, 1053.
2. Pickering, T., Lancet. 1973, ii, 1440.
3. Miller, N. E., In N. E., Miller, T. X., Barber, L. V., DiCara, J. Kamiya, D. Shapiro. & J Stoyva. (eds). Biofeedback and self-control. Chicago: Aldinc Publishing Co., 1974.
4. Althausen, T. L., Kerr, W. J., & Burnett, T. C., American Journal of Medical Science. 1929, 177. 398
5. Althausen, T L., Kerr. & W. J., American Journal of Medical Science. 1929, 777, 470