S M GOPINATH, E T PUTTAIAH, and T P NARASIMHA MURTHY. 2011. “Citric Acid Production By Aspergillus Niger Etgp12, Etgp18 On Solid State Fermentation And Effect Of Initial Temperature On Yield”. International Journal of Pharma and Bio Sciences 2 (4):254-62. https://ijpbs.net/index.php/journal/article/view/1090.