Here are some links which have been featured in the media as to the positive power of hypnobirthing:
Count The Kicks: http://www.countthekicks.org.uk/pregnancy-information/jackie-kietz-talks-hypnobirthing/
Hypnobirthing – HypNo or HypYES? http://www.kickscount.org.uk/hypnobirthing-hypno-hypyes/
Q & A Session on Hypnobirthing with Jackie Kietz over at Student Midwife.net: https://studentmidwife.net/fob/q-a-session-with-jackie-kietz-hypnobirthing.118700/
The Royal College of Midwives: https://www.rcm.org.uk/news-views-and-analysis/analysis/hypnobirthing-the-art-to-a-peaceful-birth
The Guardian: http://www.theguardian.com/uk-news/2015/aug/18/pregnant-women-on-self-hypnosis-births
The Daily Mail: http://www.dailymail.co.uk/health/article-3202205/Hospitals-report-rise-number-mums-taking-hypnobirthing-classes-alternative-pain-relief.html
The Royal College of Midwives: https://www.rcm.org.uk/sites/default/files/34-35_0.pdf