Griffith, Jeremy (2013). Freedom Book 1. Part 4:7 Second Category of Thinker: Those who admitted the involvement of our moral instincts and corrupting intellect in producing the upset state of the human condition and who attempted to explain how those elements produced that upset psychosis. [S.l.]: WTM Publishing & Communications. ISBN978-1-74129-011-0. Consultado em 28 de março de 2013
