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Diakses pada 21 Januari 2020Medical News Today. https://www.medicalnewstoday.com/articles/305996.php#2
Diakses pada 21 Januari 2020Harvard Health Publication. https://www.health.harvard.edu/blog/the-latest-scoop-on-the-health-benefits-of-coffee-2017092512429
Diakses pada 21 Januari 2020Wikipedia. https://en.wikipedia.org/wiki/Economics_of_coffee
Diakses pada 21 Januari 2020