Orison Swett Marden (2015). “ORISON SWETT MARDEN Premium Collection - Wisdom & Empowerment Series (18 Books in One Volume): Steps to Success and Power, How to Get What You Want, An Iron Will, Be Good to Yourself, Every Man A King, Keeping Fit, Prosperity – How to Attract It, Stepping-Stones To Fame And Fortune...”, p.494, e-artnow
In a letter to Russell Fritz (as known as Ron Franz), April 1992 in "Back to the Wild" by Chris McCandless and Mary Ellen Barnes, (2nd ed.), Twin Star Press, (pp. 135-137), 2013.