Is spirituality a critical ingredient of meditation? Comparing the effects of spiritual meditation, secular meditation, and relaxation on spiritual, psychological, cardiac, and pain outcomes
Journal of Behavioral Medicine (2005) - Comment
pubmed: 16049627  doi: 10.1007/s10865-005-9008-5  issn: 0160-7715  issn: 1573-3521 

Amy B. Wachholtz, Kenneth I. Pargament