Clift, S., Hancox, G., Morrison, I., Hess, B., Kreutz, G. and Stewart, D. (2010),

'Choral singing and psychological wellbeing: 

Quantitative and qualitative findings from English choirs in a cross-national survey'

Camic, P., Clift, S. and Morrison, I. (2012),

'Benefits of choral singing for social and mental wellbeing:

Qualitative findings from a cross-national survey of choir members'