Elbert Hubbard (1908). “Little Journeys to the Homes of Great Teachers: Booker T. Washington. Thomas Arnold. Erasmus. Hypatia. St. Benedict. Mary Baker Eddy”
Elbert Hubbard (2009). “Love, Life & Work: Being a Book of Opinions Reasonably Good-Natured Concerning How to Attain the Highest Happiness for One's Self with the Least Possible Harm to Others”, p.40, The Floating Press