1. Leuba, J. H. The Belief in God and Immortality: A Psychological, Anthropological and Statistical Study (Sherman, French & Co., Boston, 1916).
2. Leuba, J. H. Harper's Magazine 169, 291–300 (1934).
3. Larson, E. J. & Witham, L. Nature 386, 435–436 (1997).
4. Highfield, R. The Daily Telegraph 3 April, p. 4 (1997).
5. National Academy of Sciences Teaching About Evolution and the Nature of Science (Natl Acad. Press, Washington DC, 1998).