George Bernard Shaw (2015). “George Bernard Shaw: Collected Articles, Lectures, Essays and Letters: Thoughts and Studies from the Renowned Dramaturge and Author of Mrs. Warren’s Profession, Pygmalion, Arms and The Man, Saint Joan, Caesar and Cleopatra, Androcles And The Lion”, p.317, e-artnow
Thomas Stephen Szasz (1997). “The Manufacture of Madness: A Comparative Study of the Inquisition and the Mental Health Movement”, p.160, Syracuse University Press
Dorothea Waley Singer, Giordano Bruno (1968). “Giordano Bruno; his life and thought: With annotated translation of his work, On the infinite universe and worlds”, Greenwood Pub Group