Bhante Henepola Gunaratana (2010). “Beyond Mindfulness in Plain English: An Introductory Guide to Deeper States of Meditation”, p.43, ReadHowYouWant.com
"Dave Grohl: 'I was ready to quit music. It felt to me like music equalled death. I started praying...'". Interview with Tom Lamont, www.theguardian.com. June 27, 2011.