“Determination of total phenolic content of ethanol extract, ethyl acetate and n-hexan fraction of robusta coffee leaves (Coffea canephora Pierre ex A. Froehner) using Uv-Vis spectrofotometry method”, JPS, vol. 6, no. 4, pp. 1709–1716, Nov. 2023, doi: 10.36490/journal-jps.com.v6i4.301.