APA Style Citation

Frontier Quotes. (n.d.). BrainyQuote.com. Retrieved October 18, 2019, from BrainyQuote.com Web site: https://www.brainyquote.com/topics/frontier-quotes_4

Chicago Style Citation

Frontier Quotes. BrainyQuote.com, BrainyMedia Inc, 2019. https://www.brainyquote.com/topics/frontier-quotes_4, accessed October 18, 2019.

MLA Style Citation

"Frontier Quotes." BrainyQuote.com. BrainyMedia Inc, 2019. 18 October 2019. https://www.brainyquote.com/topics/frontier-quotes_4
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