Books, Brochures, and Chapters>Book:  Toland , John (1997-09-18), John Toland's 'christianity Not Mysterious', The Lilliput Press Ltd, Retrieved on 2011-06-17

Books, Brochures, and Chapters>Book:  Sagan , Carl and Druyan , Ann (1997-02-25), The Demon-Haunted World: Science as a Candle in the Dark, Ballantine Books, Retrieved on 2011-05-04

Books, Brochures, and Chapters>Book:  Schweitzer , Albert and Campion , C. T. (1932), The Philosophy of Civilization: Part I, the Decay and the Restoration of Civilization : Part Ii, Civilization and Ethics, Prometheus Books, Retrieved on 2011-04-19