Charles Sanders Peirce, Patricia Ann Turrisi (1997). “Pragmatism as a Principle and Method of Right Thinking: The 1903 Harvard Lectures on Pragmatism”, p.162, SUNY Press
William Shakespeare (1851). “Dictionary of Shakespearian quotations: Exhibiting the most forcible passages illustrative of the various passions, affections and emotions of the human mind”, p.158