American cosmologist Ralph Asher Alpher is best known for laying the foundations for the big-bang model of evolution.
Ralph Asher Alpher. (2013). The Biography Channel website. Retrieved 01:16, May 23, 2013, from http://www.biography.com/people/ralph-alpher-9182332.
Ralph Asher Alpher. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/ralph-alpher-9182332 [Accessed 23 May 2013].
"Ralph Asher Alpher." 2013. The Biography Channel website. May 23 2013, 01:16 http://www.biography.com/people/ralph-alpher-9182332.
"Ralph Asher Alpher," The Biography Channel website, 2013, http://www.biography.com/people/ralph-alpher-9182332 [accessed May 23, 2013].
"Ralph Asher Alpher," The Biography Channel website, http://www.biography.com/people/ralph-alpher-9182332 (accessed May 23, 2013).
Ralph Asher Alpher [Internet]. The Biography Channel website; 2013 [cited 2013 May 23] Available from: http://www.biography.com/people/ralph-alpher-9182332.
Ralph Asher Alpher, http://www.biography.com/people/ralph-alpher-9182332 (last visited May 23, 2013).
Ralph Asher Alpher. The Biography Channel website. 2013. Available at: http://www.biography.com/people/ralph-alpher-9182332. Accessed May 23, 2013.