Ambika R, Kavitha P, Panneer Selvam A, and Sengottaian N. “Production and Extraction of Indole Acetic Acid by Using Efficient Strain of Rhizobium Isolated from Maize”. World Journal of Pharmaceutical Sciences, vol. 2, no. 4, Apr. 2014, pp. 294-7, https://wjpsonline.com/index.php/wjps/article/view/extraction-indole-acetic-acid-strain-rhizobium-maize.