APA Style Citation

Robert Zubrin Quotes. (n.d.). BrainyQuote.com. Retrieved July 15, 2019, from BrainyQuote.com Web site: https://www.brainyquote.com/authors/robert_zubrin

Chicago Style Citation

Robert Zubrin Quotes. BrainyQuote.com, BrainyMedia Inc, 2019. https://www.brainyquote.com/authors/robert_zubrin, accessed July 15, 2019.

MLA Style Citation

"Robert Zubrin Quotes." BrainyQuote.com. BrainyMedia Inc, 2019. 15 July 2019. https://www.brainyquote.com/authors/robert_zubrin