James Felton. ^(2017, 30 June).The True Color Of The Statue Of Liberty – And It Isn't Blue-Green. Retrieved August 26, 2017, from http://www.iflscience.com/chemistry/the-true-color-of-the-statue-of-liberty-and-it-isnt-bluegreen/
Why does copper turn green?. Retrieved August 26, 2017, from http://www.crescentcitycopper.com/why-does-copper-turn-green.htm
Sea spray. Retrieved August 26, 2017, from https://en.wikipedia.org/wiki/Sea spray
Statue of Liberty. Retrieved August 26, 2017, from https://en.wikipedia.org/wiki/Statue_of_Liberty
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