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"Hershey: Milton S. Hershey's Extraordinary Life of Wealth, Empire, and Utopian Dreams," by Michael D'Antonio: https://www.simonandschuster.com/book...

2015 BBC article about Hershey vs Cadbury: https://www.bbc.com/news/magazine319...

2008 NYT article that deals with the butyric acid issue: https://www.nytimes.com/2008/02/13/di...

U.S. legal standards for milk chocolate: https://www.accessdata.fda.gov/script...

E.U. legal standards for milk chocolate: https://eurlex.europa.eu/legalconte...