APA Style Citation

Stephen Hawking Quotes. (n.d.). BrainyQuote.com. Retrieved May 25, 2019, from BrainyQuote.com Web site: https://www.brainyquote.com/quotes/stephen_hawking_696272

Chicago Style Citation

Stephen Hawking Quotes. BrainyQuote.com, BrainyMedia Inc, 2019. https://www.brainyquote.com/quotes/stephen_hawking_696272, accessed May 25, 2019.

MLA Style Citation

"Stephen Hawking Quotes." BrainyQuote.com. BrainyMedia Inc, 2019. 25 May 2019. https://www.brainyquote.com/quotes/stephen_hawking_696272