Putri, Eka, et al. “Increase in Polyphenolic Substances from Fermented Robusta Coffee Pulp (Coffea Canephora L.) by Using Indigenous Actinomycetes”. HAYATI Journal of Biosciences, vol. 30, no. 3, Jan. 2023, pp. 457-65, https://doi.org/10.4308/hjb.30.3.457-465.