Grape, C. et al. (2003) Does singing promote well-being?: An empirical study of professional and amateur singers during a singing lesson. Integrative Physiological and Behavioral Science, 38, 65–74.
Nilsson, U. (2009) Soothing music can increase oxytocin levels during bed rest after open-heart surgery: a randomised control trial. Journal of Clinical Nursing. 18, 2153–2161.
