Grigoriadis, Vanessa (July 9, 2001). "Pay Money, Be Happy". New York Magazine. Retrieved September 6, 2014.
quarterlyreview.org
Hann, Robert R. (Fall 1982). "Werner Erhard's est - A Religious Movement?"(PDF). Quarterly Review: A Scholarly Journal for Reflection on Ministry. 2 (3). United Methodist General Board of Higher Education; Ministry and The United Methodist Publishing House: 78–94. Archived from the original(PDF) on 2011-07-27. Retrieved 2009-09-22.
Hann, Robert R. (Fall 1982). "Werner Erhard's est - A Religious Movement?"(PDF). Quarterly Review: A Scholarly Journal for Reflection on Ministry. 2 (3). United Methodist General Board of Higher Education; Ministry and The United Methodist Publishing House: 78–94. Archived from the original(PDF) on 2011-07-27. Retrieved 2009-09-22.