Richard Abanes:Rick Warren and the Purpose that Drives Him: An Insider Looks at the Phenomenal Bestseller. Includes Exclusive Interview with Rick Warren. Harvest House Publishers, Eugene (Oregon) 2005, ISBN 978-0-7369-1738-4, Kap. 5: A New Spirituality? (eingeschränkte Vorschauin der Google-Buchsuche [abgerufen am 10.Oktober 2016]).
Richard Abanes:Rick Warren and the Purpose that Drives Him: An Insider Looks at the Phenomenal Bestseller. Includes Exclusive Interview with Rick Warren. Harvest House Publishers, Eugene (Oregon) 2005, ISBN 978-0-7369-1738-4, Kap. 5: A New Spirituality? (eingeschränkte Vorschauin der Google-Buchsuche [abgerufen am 10.Oktober 2016]).
Ernesto Soliven:Rick Warren Net Worth: Megachurch Pastor Among Richest Preachers In The World. In: International Business Times. 21.Juni 2020 (ibtimes.com[abgerufen am 23.März 2023]).