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Referensi:
 - Marsilani, O. N., & Sukartiko, A. C. (2020). Chemical profiling of western Indonesian single origin robusta coffee. In IOP Conference Series: Earth and Environmental Science (Vol. 425, No. 1, p. 012041). IOP Publishing.
 - Bhran, H. S. (2010). Coffee, Culture and Intellectual Property: Lessons for Africa from the Ethiopian Fine Coffee
Inotiative. Boston University Creative Services.
 - Wahyudi, T., & Jati, M. (2012). Challenges of sustainable coffee certification in Indonesia. International Coffee Council 109th Session,(September), 1-14.
 - Ditjenbun, Statistik Perkebunan Indonesia 2018-2020: Kopi, 77 (Kementan, Jakarta, 2019)
 - Panggabean I E 2011 Buku Pintar Kopi (Jakarta: Agromedia Pustaka)
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