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Goldberg, Robert N.; Kishore, Nand; Lennen, Rebecca M. (2002). "Thermodynamic Quantities for the Ionization Reactions of Buffers". J. Phys. Chem. Ref. Data31 (1): 231–370. doi:10.1063/1.1416902. Bibcode: 2002JPCRD..31..231G.
Lotfy, Walid A.; Ghanem, Khaled M.; El-Helow, Ehab R. (2007). "Citric acid production by a novel Aspergillus niger isolate: II. Optimization of process parameters through statistical experimental designs". Bioresource Technology98 (18): 3470–3477. doi:10.1016/j.biortech.2006.11.032. பப்மெட்:17317159.
Silva, Andre M. N.; Kong, Xiaole; Hider, Robert C. (2009). "Determination of the pKa value of the hydroxyl group in the α-hydroxycarboxylates citrate, malate and lactate by 13C NMR: implications for metal coordination in biological systems". Biometals22 (5): 771–778. doi:10.1007/s10534-009-9224-5. பப்மெட்:19288211.
"Different forms of heroin and their relationship to cook-up techniques: data on, and explanation of, use of lemon juice and other acids". Subst Use Misuse36 (5): 573–88. April 2001. doi:10.1081/ja-100103561. பப்மெட்:11419488.
"Citric acid". International Chemical Safety Cards. NIOSH. 2018-09-18. Archived from the original on July 12, 2018. பார்க்கப்பட்ட நாள் September 9, 2017.