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
Samuel Johnson (1787). “The Works of Samuel Johnson, LL.D.: Together with His Life, and Notes on His Lives of the Poets, by Sir John Hawkins, Knt. In Eleven Volumes ...”, p.156