David R. Lide, penyunting (2005). "Physical Constants of Organic Compounds". CRC Handbook of Chemistry and Physics (ed. Internet Version). Boca Raton, FL: CRC Press.
Citric acid dalam Linstrom, Peter J.; Mallard, William G. (penyunting); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (MD) (dicapai pada 2014-06-02)
