1. Guidelines for ethical conduct in the care and use of animals;American Psychological Association,1985
2. Angier N: Cultures in conflict: M.D.'s and Ph.D.'s. New York Times, C1, April 24, 1990.
3. Nothing in biology makes sense except in the light of evolution: Theodosus Dobzhansky 1900-1975;Ayala;J Hered,1977
4. Novum Organum, article XIV and article XVIII;Bacon,1947
5. Novum Organum, book I;Bacon,1947