P. Simkin, A. Bolding "Update on nonpharmacologic approaches to relieve labor pain and prevent suffering" Journal of Midwifery & Women's Health, Volume 49, no. 6, p. 489-504 online versionArchived July 7, 2011, at the Wayback Machine
"A survey investigation of the effects of music listening on chronic pain" Laura A. Mitchell et al, Psychology of Musicabstract
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P. Simkin, A. Bolding "Update on nonpharmacologic approaches to relieve labor pain and prevent suffering" Journal of Midwifery & Women's Health, Volume 49, no. 6, p. 489-504 online versionArchived July 7, 2011, at the Wayback Machine