Evan E. Bolton; Yanli Wang; Paul A. Thiessen; Stephen H. Bryant (2008). „Chapter 12 PubChem: Integrated Platform of Small Molecules and Biological Activities”. Annual Reports in Computational Chemistry. 4: 217—241. doi:10.1016/S1574-1400(08)00012-1.
Goldberg, Robert N.; Kishore, Nand; Lennen, Rebecca M. (2002). „Thermodynamic Quantities for the Ionization Reactions of Buffers”. J. Phys. Chem. Ref. Data. 31 (1): 231—370. Bibcode:2002JPCRD..31..231G. doi:10.1063/1.1416902.
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”. Biometals. 22 (5): 771—778. PMID19288211. doi:10.1007/s10534-009-9224-5.
Matzapetakis, M.; Raptopoulou, C. P.; Tsohos, A.; Papaefthymiou, V.; Moon, S. N.; Salifoglou, A. (1998). „Synthesis, Spectroscopic and Structural Characterization of the First Mononuclear, Water Soluble Iron−Citrate Complex, (NH4)5Fe(C6H4O7)2·2H2O”. J. Am. Chem. Soc. 120 (50): 13266—13267. doi:10.1021/ja9807035.
Goldberg, Robert N.; Kishore, Nand; Lennen, Rebecca M. (2002). „Thermodynamic Quantities for the Ionization Reactions of Buffers”. J. Phys. Chem. Ref. Data. 31 (1): 231—370. Bibcode:2002JPCRD..31..231G. doi:10.1063/1.1416902.
Scheele, Carl Wilhelm (1784). „Anmärkning om Citron-saft, samt sätt at crystallisera densamma” [Note about lemon juice, as well as ways to crystallize it]. Kungliga Vetenskaps Academiens Nya Handlingar [New Proceedings of the Royal Academy of Science]. 2nd series. 5: 105—109.
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”. Biometals. 22 (5): 771—778. PMID19288211. doi:10.1007/s10534-009-9224-5.
Citric acid in Linstrom, P.J.; Mallard, W.G. (eds.) NIST Chemistry WebBook, NIST Standard Reference Database Number 69. National Institute of Standards and Technology, Gaithersburg MD. http://webbook.nist.gov (retrieved 2014-06-02)