- Joseph Silk (2009). Horizons of Cosmology. Templeton Press. p. 208.
- Simon Singh (2005). Big Bang: The Origin of the Universe. Harper Perennial. p. 560.
Wollack, E. J. (10 December 2010). "Cosmology: The Study of the Universe". Universe 101: Big Bang Theory. NASA. Archived frae the oreeginal on 14 May 2011. Retrieved 27 April 2011.
The second section discusses the classic tests of the Big Bang theory that make it so compelling as the likely valid description of our universe.