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.481, e-artnow
James Russell Lowell (1872). “Among my Books: Contents: Dryden. Witchcraft. Shakespeare once more. New England two centuries ago. Lessing. Rousseau and the Sentimentalists”, p.363