1. DSM, 2014. https://www.dsm.com/content/dam/dsm/anh/en_US/Documents/, Feedinfo_Roundtable_Eubiotics_2014_Oct.pdf.
2. Markets and Markets, 2015. http://www.marketsandmarkets.com/PressReleases/organic-acid.asp.
3. New perspectives of citric acid production and applications;Soccol;Food Technology and Biotechnology,2006
4. Production of organic acids: citric, gluconic, and lactic acids;Ryu,2008
5. Production and application of lactic acid;Rodrigues,2017