Yuniarti, Reni, et al. “Effect of Citric Acid Concentration on the Pectin Characteristics of Robusta Coffee (Coffea Canephora) Pulp”. Jurnal Teknologi Dan Industri Pangan, vol. 37, no. 2, July 2026, pp. 111-9, https://doi.org/10.6066/jtip.2026.37.2.111.