APA Style Citation
John D. Barrow. (n.d.). BrainyQuote.com. Retrieved May 23, 2013, from BrainyQuote.com Web site: http://www.brainyquote.com/quotes/authors/j/john_d_barrow.html
Chicago Style Citation
John D. Barrow. BrainyQuote.com, Xplore Inc, 2013. http://www.brainyquote.com/quotes/authors/j/john_d_barrow.html, accessed May 23, 2013.
MLA Style Citation
"John D. Barrow." BrainyQuote.com. Xplore Inc, 2013. 23 May 2013. http://www.brainyquote.com/quotes/authors/j/john_d_barrow.html
