1. al-Kasim ibn Ihrahim's argument from Design;Abrahamov;Oriens,1986
2. The rescuer from error;Al-Ghazali,1917
3. Extraterrestrial cause for the Cretaceous–Tertiary extinction;Alvarez;Science,1980
4. American Heritage Dictionary, Second College Edition, 1985. Houghton Mifflin, Boston, 1568 pp.
5. The British Association for the Advancement of Science, Edinburgh;Anonymous,1871